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Clairwood quarries, Umhlatuzana valley, Durban, eThekwini Metropolitan Municipality, KwaZulu-Natal, South Africai
Regional Level Types
Clairwood quarriesGroup of Quarries
Umhlatuzana valleyValley
DurbanCity
eThekwini Metropolitan MunicipalityMunicipality
KwaZulu-NatalProvince
South AfricaCountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
29° 54' 48'' South , 30° 59' 6'' East
Latitude & Longitude (decimal):
-29.91344,30.98502
GeoHash:
G#: kdwjc46te
GRN:
S20E20
Type:
Group of Quarries
KΓΆppen climate type:
Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Berea15,000 (2012)6.9km
Durban3,120,282 (2012)7.5km
Mpumalanga140,121 (2013)35.4km
Tongaat Beach722 (2017)37.0km
eMkhomazi20,410 (2018)37.2km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
The Natal Gem and Mineral SocietyQueensburgh, Durban , KwaZulu-Natal8km
Mindat Locality ID:
53785
Long-form identifier:
mindat:1:2:53785:3
GUID (UUID V4):
c44ef867-c819-4168-8af4-b5f45665358a


GPS coordinates are approximate.

The Clairwood quarries complex is situated on the properties Mobeni 13538 (Subs 517, 518 and 2191), Lamont 845, in the Umhlatuzana valley. There were two quarries in the complex: one working sandstone (Natal series, Cape System) on Sub 518 (begun circa 1885, and buried beneath dumped decomposed tillite overburden during the late 1980s and early 1990s), and a deep pit in tillite (Dwyka series, Karroo System) on Sub 517, begun 1947. At depth, the tillite was intruded by a dolerite sill (Stormberg series, Karroo System). The pit on Sub 517 hosted all the minerals of interest. The quarry ceased operations in 1992, was flooded by 1994, and, at the close of the century, was being rehabilitated into a recreational area.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


31 valid minerals.

Detailed Mineral List:

β“˜ Analcime
Formula: Na(AlSi2O6) · H2O
β“˜ Baryte
Formula: BaSO4
β“˜ Calcite
Formula: CaCO3
β“˜ Chabazite-Ca
Formula: (Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
β“˜ Chabazite-Na
Formula: (Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
β“˜ Chantalite
Formula: CaAl2(SiO4)(OH)4
β“˜ Dickite
Formula: Al2(Si2O5)(OH)4
β“˜ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
β“˜ Ferricopiapite
Formula: Fe3+0.67Fe3+4(SO4)6(OH)2 · 20H2O
β“˜ Ferrimolybdite
Formula: Fe2(MoO4)3 · nH2O
β“˜ Fluorapophyllite-(K)
Formula: KCa4(Si8O20)(F,OH) · 8H2O
β“˜ Fluorite
Formula: CaF2
β“˜ Goethite
Formula: Ξ±-Fe3+O(OH)
β“˜ Gypsum
Formula: CaSO4 · 2H2O
β“˜ Halotrichite
Formula: FeAl2(SO4)4 · 22H2O
β“˜ Heulandite-Ca
Formula: (Ca,Na)5(Si27Al9)O72 · 26H2O
β“˜ Jarosite
Formula: KFe3+3(SO4)2(OH)6
β“˜ Kaolinite
Formula: Al2(Si2O5)(OH)4
β“˜ Laumontite
Formula: CaAl2Si4O12 · 4H2O
β“˜ 'Limonite'
β“˜ 'Manganese Oxides'
β“˜ Montmorillonite
Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
β“˜ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
β“˜ Muscovite var. Illite
Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2
β“˜ Nacrite
Formula: Al2(Si2O5)(OH)4
β“˜ Phillipsite-Na
Formula: (Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2O
β“˜ Prehnite
Formula: Ca2Al2Si3O10(OH)2
β“˜ Pyrite
Formula: FeS2
β“˜ Quartz
Formula: SiO2
β“˜ RomanΓ¨chite
Formula: (Ba,H2O)2(Mn4+,Mn3+)5O10
β“˜ Saponite ?
Formula: Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Description: Has yet to be verified
β“˜ Siderite
Formula: FeCO3
β“˜ Truscottite
Formula: (Ca,Mn)14Si24O58(OH)8 · 2H2O
β“˜ Zircon
Formula: Zr(SiO4)

Gallery:

Fe2(MoO4)3 · nH2Oβ“˜ Ferrimolybdite
Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2Oβ“˜ Saponite ?

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
β“˜Pyrite2.EB.05aFeS2
Group 3 - Halides
β“˜Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
β“˜Goethite4.00.Ξ±-Fe3+O(OH)
β“˜Quartz4.DA.05SiO2
β“˜RomanΓ¨chite4.DK.10(Ba,H2O)2(Mn4+,Mn3+)5O10
Group 5 - Nitrates and Carbonates
β“˜Siderite5.AB.05FeCO3
β“˜Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
β“˜Baryte7.AD.35BaSO4
β“˜Jarosite7.BC.10KFe3+3(SO4)2(OH)6
β“˜Halotrichite7.CB.85FeAl2(SO4)4 Β· 22H2O
β“˜Gypsum7.CD.40CaSO4 Β· 2H2O
β“˜Ferricopiapite7.DB.35Fe3+0.67Fe3+4(SO4)6(OH)2 Β· 20H2O
β“˜Ferrimolybdite7.GB.30Fe2(MoO4)3 Β· nH2O
Group 9 - Silicates
β“˜Zircon9.AD.30Zr(SiO4)
β“˜Chantalite9.AG.55CaAl2(SiO4)(OH)4
β“˜Epidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
β“˜Prehnite9.DP.20Ca2Al2Si3O10(OH)2
β“˜Fluorapophyllite-(K)9.EA.15KCa4(Si8O20)(F,OH) Β· 8H2O
β“˜Muscovite
var. Illite		9.EC.15K0.65Al2.0[Al0.65Si3.35O10](OH)2
β“˜9.EC.15KAl2(AlSi3O10)(OH)2
β“˜Montmorillonite9.EC.40(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 Β· nH2O
β“˜Saponite ?9.EC.45Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 Β· nH2O
β“˜Nacrite9.ED.05Al2(Si2O5)(OH)4
β“˜Kaolinite9.ED.05Al2(Si2O5)(OH)4
β“˜Dickite9.ED.05Al2(Si2O5)(OH)4
β“˜Truscottite9.EE.35(Ca,Mn)14Si24O58(OH)8 Β· 2H2O
β“˜Analcime9.GB.05Na(AlSi2O6) Β· H2O
β“˜Laumontite9.GB.10CaAl2Si4O12 Β· 4H2O
β“˜Phillipsite-Na9.GC.10(Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] Β· 12H2O
β“˜Chabazite-Ca9.GD.10(Ca,K2,Na2)2[Al2Si4O12]2 Β· 12H2O
β“˜Chabazite-Na9.GD.10(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 Β· 12H2O
β“˜Heulandite-Ca9.GE.05(Ca,Na)5(Si27Al9)O72 Β· 26H2O
Unclassified
β“˜'Limonite'-
β“˜'Manganese Oxides'-

List of minerals for each chemical element

HHydrogen
Hβ“˜ AnalcimeNa(AlSi2O6) · H2O
Hβ“˜ ChantaliteCaAl2(SiO4)(OH)4
Hβ“˜ DickiteAl2(Si2O5)(OH)4
Hβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hβ“˜ FerricopiapiteFe3+0.67Fe43+(SO4)6(OH)2 · 20H2O
Hβ“˜ FerrimolybditeFe2(MoO4)3 · nH2O
Hβ“˜ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Hβ“˜ GoethiteΞ±-Fe3+O(OH)
Hβ“˜ GypsumCaSO4 · 2H2O
Hβ“˜ HalotrichiteFeAl2(SO4)4 · 22H2O
Hβ“˜ Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Hβ“˜ JarositeKFe33+(SO4)2(OH)6
Hβ“˜ KaoliniteAl2(Si2O5)(OH)4
Hβ“˜ LaumontiteCaAl2Si4O12 · 4H2O
Hβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Hβ“˜ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Hβ“˜ NacriteAl2(Si2O5)(OH)4
Hβ“˜ PrehniteCa2Al2Si3O10(OH)2
Hβ“˜ RomanΓ¨chite(Ba,H2O)2(Mn4+,Mn3+)5O10
Hβ“˜ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Hβ“˜ Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2O
Hβ“˜ Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Hβ“˜ Chabazite-Na(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
Hβ“˜ Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Hβ“˜ Phillipsite-Na(Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2O
CCarbon
Cβ“˜ CalciteCaCO3
Cβ“˜ SideriteFeCO3
OOxygen
Oβ“˜ AnalcimeNa(AlSi2O6) · H2O
Oβ“˜ BaryteBaSO4
Oβ“˜ CalciteCaCO3
Oβ“˜ ChantaliteCaAl2(SiO4)(OH)4
Oβ“˜ DickiteAl2(Si2O5)(OH)4
Oβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oβ“˜ FerricopiapiteFe3+0.67Fe43+(SO4)6(OH)2 · 20H2O
Oβ“˜ FerrimolybditeFe2(MoO4)3 · nH2O
Oβ“˜ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Oβ“˜ GoethiteΞ±-Fe3+O(OH)
Oβ“˜ GypsumCaSO4 · 2H2O
Oβ“˜ HalotrichiteFeAl2(SO4)4 · 22H2O
Oβ“˜ Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Oβ“˜ JarositeKFe33+(SO4)2(OH)6
Oβ“˜ KaoliniteAl2(Si2O5)(OH)4
Oβ“˜ LaumontiteCaAl2Si4O12 · 4H2O
Oβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Oβ“˜ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Oβ“˜ NacriteAl2(Si2O5)(OH)4
Oβ“˜ PrehniteCa2Al2Si3O10(OH)2
Oβ“˜ QuartzSiO2
Oβ“˜ RomanΓ¨chite(Ba,H2O)2(Mn4+,Mn3+)5O10
Oβ“˜ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Oβ“˜ SideriteFeCO3
Oβ“˜ Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2O
Oβ“˜ ZirconZr(SiO4)
Oβ“˜ Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Oβ“˜ Chabazite-Na(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
Oβ“˜ Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Oβ“˜ Phillipsite-Na(Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2O
FFluorine
Fβ“˜ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Fβ“˜ FluoriteCaF2
NaSodium
Naβ“˜ AnalcimeNa(AlSi2O6) · H2O
Naβ“˜ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Naβ“˜ Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Naβ“˜ Chabazite-Na(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
Naβ“˜ Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Naβ“˜ Phillipsite-Na(Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2O
MgMagnesium
Mgβ“˜ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Mgβ“˜ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Mgβ“˜ Chabazite-Na(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
AlAluminium
Alβ“˜ AnalcimeNa(AlSi2O6) · H2O
Alβ“˜ ChantaliteCaAl2(SiO4)(OH)4
Alβ“˜ DickiteAl2(Si2O5)(OH)4
Alβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alβ“˜ HalotrichiteFeAl2(SO4)4 · 22H2O
Alβ“˜ Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Alβ“˜ KaoliniteAl2(Si2O5)(OH)4
Alβ“˜ LaumontiteCaAl2Si4O12 · 4H2O
Alβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Alβ“˜ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Alβ“˜ NacriteAl2(Si2O5)(OH)4
Alβ“˜ PrehniteCa2Al2Si3O10(OH)2
Alβ“˜ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Alβ“˜ Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Alβ“˜ Chabazite-Na(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
Alβ“˜ Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Alβ“˜ Phillipsite-Na(Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2O
SiSilicon
Siβ“˜ AnalcimeNa(AlSi2O6) · H2O
Siβ“˜ ChantaliteCaAl2(SiO4)(OH)4
Siβ“˜ DickiteAl2(Si2O5)(OH)4
Siβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siβ“˜ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Siβ“˜ Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Siβ“˜ KaoliniteAl2(Si2O5)(OH)4
Siβ“˜ LaumontiteCaAl2Si4O12 · 4H2O
Siβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Siβ“˜ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Siβ“˜ NacriteAl2(Si2O5)(OH)4
Siβ“˜ PrehniteCa2Al2Si3O10(OH)2
Siβ“˜ QuartzSiO2
Siβ“˜ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Siβ“˜ Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2O
Siβ“˜ ZirconZr(SiO4)
Siβ“˜ Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Siβ“˜ Chabazite-Na(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
Siβ“˜ Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Siβ“˜ Phillipsite-Na(Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2O
SSulfur
Sβ“˜ BaryteBaSO4
Sβ“˜ FerricopiapiteFe3+0.67Fe43+(SO4)6(OH)2 · 20H2O
Sβ“˜ GypsumCaSO4 · 2H2O
Sβ“˜ HalotrichiteFeAl2(SO4)4 · 22H2O
Sβ“˜ JarositeKFe33+(SO4)2(OH)6
Sβ“˜ PyriteFeS2
KPotassium
Kβ“˜ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Kβ“˜ Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Kβ“˜ JarositeKFe33+(SO4)2(OH)6
Kβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Kβ“˜ Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Kβ“˜ Chabazite-Na(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
Kβ“˜ Phillipsite-Na(Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2O
CaCalcium
Caβ“˜ CalciteCaCO3
Caβ“˜ ChantaliteCaAl2(SiO4)(OH)4
Caβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caβ“˜ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Caβ“˜ FluoriteCaF2
Caβ“˜ GypsumCaSO4 · 2H2O
Caβ“˜ LaumontiteCaAl2Si4O12 · 4H2O
Caβ“˜ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Caβ“˜ PrehniteCa2Al2Si3O10(OH)2
Caβ“˜ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Caβ“˜ Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2O
Caβ“˜ Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Caβ“˜ Chabazite-Na(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
Caβ“˜ Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Caβ“˜ Phillipsite-Na(Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2O
MnManganese
Mnβ“˜ RomanΓ¨chite(Ba,H2O)2(Mn4+,Mn3+)5O10
Mnβ“˜ Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2O
FeIron
Feβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feβ“˜ FerricopiapiteFe3+0.67Fe43+(SO4)6(OH)2 · 20H2O
Feβ“˜ FerrimolybditeFe2(MoO4)3 · nH2O
Feβ“˜ GoethiteΞ±-Fe3+O(OH)
Feβ“˜ HalotrichiteFeAl2(SO4)4 · 22H2O
Feβ“˜ JarositeKFe33+(SO4)2(OH)6
Feβ“˜ PyriteFeS2
Feβ“˜ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Feβ“˜ SideriteFeCO3
SrStrontium
Srβ“˜ Chabazite-Na(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
ZrZirconium
Zrβ“˜ ZirconZr(SiO4)
MoMolybdenum
Moβ“˜ FerrimolybditeFe2(MoO4)3 · nH2O
BaBarium
Baβ“˜ BaryteBaSO4
Baβ“˜ RomanΓ¨chite(Ba,H2O)2(Mn4+,Mn3+)5O10
Baβ“˜ Phillipsite-Na(Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2O

Other Regions, Features and Areas containing this locality

African Plate
Somali PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

McCarthy, M.J. (1967). Stratigraphical and sedimentological evidence from the Durban region of major sea-level movements since the Late Tertiary. Transactions of the Geological Society of South Africa, 70, 135-165.
Heron, H.D.C. (1985) Identification of Clairwood apophyllite as fluorapophyllite. Micro News and Views, 12(1).
Heron, H.D.C. (1990/1991) A note on manganese dendrite and oxide masses from selected Natal localities. Micro News and Views, 17(1): 2-6, 17(2): 2-4.
Heron, H.D.C. (1991) A psilomelane-bearing assemblage from Clairwood Quarries, Durban. Micro News and Views, 17(4): 1-4 and 18(1): 1-4.
Heron, H.D.C. (1991) An occurrence of tabular calcite in a boulder at Clairwood Quarries, Durban, South Africa. The Spar Box 1(3): 5-8. [Reprinted in Micro News and Views, 24(4): 18-20 (1997).]
Heron, H.D.C. (1992) Clairwood Quarries update. Micro News and Views, 18(3).
Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.
Heron, H.D.C. (1994) Siderite assemblages from Clairwood Quarries, Durban, Natal. Micro News and Views, 20(2): 3-7.
Cairncross, B., Dixon, R. (1995) Minerals of South Africa. Geological Society of South Africa, Linden .
Heron, H.D.C. (1995) An occurrence of partially overgrown "sandwich" calcite crystals from a tillite fissure at Clairwood Quarries, Durban. Micro News and Views, 21(3): 4-6.
Heron, H.D.C. (1996) The occurrence of apophyllite at five KwaZulu-Natal localities. Micro News and Views, 23(1): 3-6.
Heron, H.D.C. (2001) Gypsum occurrences in four tillite quarries of coastal Natal. Micro News and Views, 27(2): 11-15. [Reprinted in S.A. Lapidary Magazine, 33(2): 11-18 (2001).]
Heron. H.D.C. (2004) Barite occurrences at Clairwood Quarries in Durban, Natal, South Africa. S.A. Lapidary Magazine, 36(3): 5-25.
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