Norcross-Madagascar "Crocodile Jasper" fields, Tsiroanomandidy District, Bongolava, Madagascari
| Regional Level Types | |
|---|---|
| Norcross-Madagascar "Crocodile Jasper" fields | Exploration Area |
| Tsiroanomandidy District | District |
| Bongolava | Region |
| Madagascar | Country |
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Latitude & Longitude (WGS84):
18° South , 45° East (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~95km
Type:
Köppen climate type:
Mindat Locality ID:
301014
Long-form identifier:
mindat:1:2:301014:6
GUID (UUID V4):
20db4764-7ebf-4bf6-a03e-b97f28ff4b61
Name(s) in local language(s):
Karieran'i Norcross, Distrikan'i Tsiroanomandidy, Faritra Bongolava, Faritanin' Antananarivo, Madagasikara
The socallled "Kabamba Jasper" or "Crocodile Jasper" is, according to Madagascar Minerals's homepage [http://www.madagascarminerals.com/cat_crocodile_jasper1.cfm] found in an area quarried by Norcross. The exact locality area is not known, but belived to be in the Ambohiby and/or Bevato intrusive igneous batolites about 15-20 km east of the town Tsiroanomandidy. Veins of rhyolite are described as a rarity within these batolites.
The "Kabamba Jasper" is not jasper nor stromatolites (as it is sold as), but in fact a volcanic rhyolite rock. The EPI-Institute in Germany has studied the rock by thin section and XRD. The greenish colored rock consist of the minerals quartz, pyroxene (aegirine), albite, and K feldspar. The characteristic, blackish, rounded aggregates consist of needles of amphiboles (riebeckite to paragasite in composition).
For discussion see messageboard at https://www.mindat.org/forum.php?read,62,421984,422090#msg-422090.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
3 valid minerals. 1 erroneous literature entry.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Aegirine Formula: NaFe3+Si2O6 |
| ⓘ Albite Formula: Na(AlSi3O8) |
| ⓘ 'Amphibole Supergroup' Formula: AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| ⓘ 'K Feldspar' |
| ⓘ 'Pyroxene Group' Formula: ADSi2O6 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Description: Socalled "crocodile jasper" is quarried and sold from this area. However this is not a jasper a greenish colored volcanic rock, a rhyolite. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | var. Jasper ? | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Aegirine | 9.DA.25 | NaFe3+Si2O6 |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| Unclassified Minerals, Rocks, etc. | |||
| ⓘ | 'Amphibole Supergroup' | - | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| ⓘ | 'K Feldspar' | - | |
| ⓘ | 'Pyroxene Group' | - | ADSi2O6 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| O | Oxygen | |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Pyroxene Group | ADSi2O6 |
| O | ⓘ Aegirine | NaFe3+Si2O6 |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| F | Fluorine | |
| F | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Na | Sodium | |
| Na | ⓘ Aegirine | NaFe3+Si2O6 |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Al | Aluminium | |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Al | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Pyroxene Group | ADSi2O6 |
| Si | ⓘ Aegirine | NaFe3+Si2O6 |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Cl | Chlorine | |
| Cl | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Ti | Titanium | |
| Ti | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Fe | Iron | |
| Fe | ⓘ Aegirine | NaFe3+Si2O6 |
Other Regions, Features and Areas containing this locality
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References
