Unnamed (OH-analogue of humite)
Valid as an unnamed mineral
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About Unnamed (OH-analogue of humite)
Formula:
Mg7(SiO4)3(OH)2
Colour:
pale yellow-orange
Crystal System:
Orthorhombic
Member of:
First Recorded Locality:
Also known as a synthetic material (Wunder et al., 1995). Forms a series with the F-dominant end-member humite; the natural material contains ~0.44 apfu F.
Unique Identifiers
Mindat ID:
470721
Long-form identifier:
mindat:1:1:470721:5
GUID
(UUID V4):
(UUID V4):
f90626f0-6b37-454b-9063-0026ffa2cf46
IMA Classification of Unnamed (OH-analogue of humite)
IMA status notes:
Unnamed (probably valid)
Classification of Unnamed (OH-analogue of humite)
9.AF.50
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
Physical Properties of Unnamed (OH-analogue of humite)
Transparency:
Transparent
Colour:
pale yellow-orange
Optical Data of Unnamed (OH-analogue of humite)
Type:
Biaxial (+)
Dispersion:
weak; r > v
Optical Extinction:
parallel
Pleochroism:
Weak
Comments:
very weak near-colorless/very pale yellow pleochroism
Comments:
~0.020 (2nd order blue) birefringence
Chemistry of Unnamed (OH-analogue of humite)
Mindat Formula:
Mg7(SiO4)3(OH)2
Elements listed:
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| P2O5 | 0.01 % |
| SiO2 | 36.55 % |
| TiO2 | 0.33 % |
| Al2O3 | 0.01 % |
| B2O3 (estimated) | 0.32 % |
| Fe2O3* | 0.50 % |
| FeO* | 0.55 % |
| MnO | 0.08 % |
| ZnO | 0.01 % |
| MgO | 57.19 % |
| CaO | 0.01 % |
| SrO | 0.01 % |
| F | 1.72 % |
| H2O (by stoichiometry) | 2.97 % |
| -O=F | -0.73 % |
| Total: | 99.53 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | (Mg6.90Fe2+0.04Fe3+0.03Ti0.02Mn2+0.01)[Si0.99B0.01O4]3((OH)1.52F0.44O0.04) |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Akhmatovskaya Kop', Nazyamskie Mountains, Zlatoust, Chelyabinsk Oblast, Russia | Unnamed (OH-analogue of humite), or "hydroxylhumite", occurs as abundant pale yellow-orange clusters of crystals in a dolomitic marble, with ludwigite and minor magnetite. In thin section, the mineral is very weakly pleochroic in near-colorless to very pale yellow in PPL. In XP the mineral shows parallel extinction, 2nd order blue birefringence (~0.020), and is B(+) with a 2V° of ~70°±5°. Chemical analysis by EPMA (WDS). *All Fe initially measured as Fe2+; Fe3+ (and Fe2O3) calculated from charge balance, but note that the very small amount of Fe present in the sample results in potentially large errors in Fe3+/∑Fe estimation. H2O calculated from stoichiometry; O in the OH site = 2*Ti. Estimated B2O3 (~1000 ppm B) added in to improve IV-site occupancy and analytical total (this is slated to be verified by ICP-MS and will be updated as necessary). |
Crystallography of Unnamed (OH-analogue of humite)
Crystal System:
Orthorhombic
First Recorded Occurrence of Unnamed (OH-analogue of humite)
Relationship of Unnamed (OH-analogue of humite) to other Species
Member of:
Other Members of this group:
| Chondrodite | Mg5(SiO4)2F2 | Mon. 2/m : P21/b |
| Clinohumite | Mg9(SiO4)4F2 | Mon. 2/m : P21/b |
| Humite | Mg7(SiO4)3F2 | Orth. mmm (2/m 2/m 2/m) : Pnma |
| Hydroxylchondrodite | Mg5(SiO4)2(OH)2 | Mon. 2/m : P21/b |
| Hydroxylclinohumite | Mg9(SiO4)4(OH)2 | Mon. 2/m : P21/b |
| Norbergite | Mg3(SiO4)F2 | Orth. mmm (2/m 2/m 2/m) |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 9.AF. | Chegemite | Ca7(SiO4)3(OH)2 |
| 9.AF. | Barwoodite | Mn2+6Nb5+(SiO4)2O3(OH)3 |
| 9.AF. | Jingwenite-(Y) | YAlV4+(SiO4)O2(OH)2 |
| 9.AF.05 | Sillimanite | Al2(SiO4)O |
| 9.AF.05 | Xenolite | Al10Si8O31 |
| 9.AF.10 | Andalusite | Al2(SiO4)O |
| 9.AF.10 | Kanonaite | Mn3+Al(SiO4)O |
| 9.AF.15 | Kyanite | Al2(SiO4)O |
| 9.AF.20 | Mullite | Al4+2xSi2-2xO10-x |
| 9.AF.20 | Krieselite | Al2(GeO4)F2 |
| 9.AF.23 | Boromullite | Al9BSi2O19 |
| 9.AF.25 | Yoderite | Mg(Al,Fe3+)3(SiO4)2O(OH) |
| 9.AF.30 | Magnesiostaurolite | Mg(Mg,Li)3(Al,Mg)18Si8O44(OH)4 |
| 9.AF.30 | Staurolite | Fe2+2Al9Si4O23(OH) |
| 9.AF.30 | Zincostaurolite | Zn2Al9Si4O23(OH) |
| 9.AF.35 | Topaz | Al2(SiO4)(F,OH)2 |
| 9.AF.40 | Norbergite | Mg3(SiO4)F2 |
| 9.AF.45 | Alleghanyite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.45 | Chondrodite | Mg5(SiO4)2F2 |
| 9.AF.45 | Reinhardbraunsite | Ca5(SiO4)2(OH,F)2 |
| 9.AF.45 | Kumtyubeite | Ca5(SiO4)2F2 |
| 9.AF.45 | Hydroxylchondrodite | Mg5(SiO4)2(OH)2 |
| 9.AF.50 | Humite | Mg7(SiO4)3F2 |
| 9.AF.50 | Manganhumite | (Mn2+,Mg)7(SiO4)3(OH)2 |
| 9.AF.50 | Unnamed (Ca-analogue of Humite) | Ca7(SiO4)4F2 |
| 9.AF.50 | Fluorchegemite | Ca7(SiO4)3F2 |
| 9.AF.55 | Clinohumite | Mg9(SiO4)4F2 |
| 9.AF.55 | Sonolite | Mn2+9(SiO4)4(OH)2 |
| 9.AF.55 | Hydroxylclinohumite | Mg9(SiO4)4(OH)2 |
| 9.AF.60 | Leucophoenicite | Mn2+7(SiO4)3(OH)2 |
| 9.AF.65 | Ribbeite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.70 | Jerrygibbsite | Mn2+9(SiO4)4(OH)2 |
| 9.AF.75 | Franciscanite | Mn2+6(V5+,◻)2(SiO4)2(O,OH)6 |
| 9.AF.75 | Örebroite | Mn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3 |
| 9.AF.75 | Welinite | Mn2+6(W6+,Mg)2(SiO4)2(O,OH)6 |
| 9.AF.75 | Scorticoite | Mn6(Sb,◻)Σ2(SiO4)2O3(OH)3 |
| 9.AF.80 | Ellenbergerite | Mg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10 |
| 9.AF.85 | Chloritoid | (Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2 |
| 9.AF.85 | Magnesiochloritoid | MgAl2(SiO4)O(OH)2 |
| 9.AF.85 | Ottrélite | (Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2 |
| 9.AF.90 | Poldervaartite | CaCa[SiO3(OH)](OH) |
| 9.AF.90 | Olmiite | CaMn2+[SiO3(OH)](OH) |
| 9.AF.95 | Pilawite-(Y) | Ca2Y2Al4(SiO4)4O2(OH)2 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Unnamed (OH-analogue of humite)
mindat.org URL:
https://www.mindat.org/min-470721.html
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References for Unnamed (OH-analogue of humite)
Reference List:
Localities for Unnamed (OH-analogue of humite)
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The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Russia (FRL) | |
| Frank K. Mazdab collection +2 other references |
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Akhmatovskaya Kop', Nazyamskie Mountains, Zlatoust, Chelyabinsk Oblast, Russia