Santanaite
A valid IMA mineral species
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Formula:
Pb11(CrO4)O12
Colour:
Straw-yellow
Lustre:
Adamantine
Hardness:
4
Specific Gravity:
9.155 (Calculated)
Crystal System:
Hexagonal
Name:
Named after its discovery locality.
Needs restudy.
Unique Identifiers
Mindat ID:
3526
Long-form identifier:
mindat:1:1:3526:8
IMA Classification of Santanaite
Approved
IMA Formula:
Pb2+9Pb4+2Cr6+O16
Approval year:
1971
First published:
1972
Classification of Santanaite
7.FB.10
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
B : With additional O,V, S, Cl
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
B : With additional O,V, S, Cl
Dana 7th ed.:
35.4.1.1
35.4.1.1
35 : ANHYDROUS CHROMATES
4 : Miscellaneous
35 : ANHYDROUS CHROMATES
4 : Miscellaneous
27.2.7
27 : Sulphites, Chromates, Molybdates and Tungstates
2 : Chromates
27 : Sulphites, Chromates, Molybdates and Tungstates
2 : Chromates
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| San | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Santanaite
Adamantine
Colour:
Straw-yellow
Hardness:
4 on Mohs scale
Cleavage:
Perfect
{0001} perfect, also {1210} and rarely {1010}
{0001} perfect, also {1210} and rarely {1010}
Density:
9.155 g/cm3 (Calculated)
Optical Data of Santanaite
Type:
Uniaxial (-)
RI values:
nω = 2.32 nε = 2.12
Max. Birefringence:
δ = 0.200
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Colour in reflected light:
Dirty gray-brown colors
Pleochroism:
Weak
Chemistry of Santanaite
Mindat Formula:
Pb11(CrO4)O12
Elements listed:
Crystallography of Santanaite
Crystal System:
Hexagonal
Class (H-M):
622 - Trapezohedral
Space Group:
P6322
Cell Parameters:
a = 9.03 Å, c = 39.84 Å
Ratio:
a:c = 1 : 4.412
Unit Cell V:
2,813.36 ų (Calculated from Unit Cell)
Z:
6
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.539 Å | (100) |
| 2.948 Å | (40) |
| 2.606 Å | (80) |
| 2.243 Å | (40) |
| 2.100 Å | (40) |
| 2.080 Å | (50) |
| 1.701 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47e : [Vanadates, chromates, manganates] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Santanaite
General Appearance of Type Material:
Aggregates of platelets up to 0.5 mm long, 0.2 mm wide, in a druse surrounded by corroded galena.
Place of Conservation of Type Material:
No designated type material.
Associated Minerals at Type Locality:
Other Language Names for Santanaite
Related Minerals - Strunz-mindat Grouping
| 7.FB.05 | Georgerobinsonite | Pb4(CrO4)2(OH)2FCl |
| 7.FB.05 | Phoenicochroite | Pb2(CrO4)O |
| 7.FB.15 | Wattersite | [Hg2]2+2Hg2+[CrO4]O2 |
| 7.FB.20 | Deanesmithite | [Hg2]2+Hg2+3[CrO4]S2O |
| 7.FB.25 | Edoylerite | Hg2+3(CrO4)S2 |
| 7.FB.30 | Reynoldsite | Pb2Mn4+2O5(CrO4) |
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 Santanaite
mindat.org URL:
https://www.mindat.org/min-3526.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Santanaite
Localities for Santanaite
Showing 1 localities.
symbol to view information about a locality.
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.
Chile (TL) | |
| Mücke (1972) +2 other references |
