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Crimsonite

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Formula:
PbFe3+2(PO4)2(OH)2
Colour:
deep red
Lustre:
Adamantine
Hardness:
Specific Gravity:
5.180 (Calculated)
Crystal System:
Orthorhombic
Member of:
Name:
The name is based upon the mineral’s deep red (crimson) color and the fact that it is the phosphate analogue of carminite, a mineral with a very similar deep red colour and whose name is also based upon its colour (carmine).
The P analogue of carminite. Chemically related to kintoreite and pattersonite.

In the structure, there are edge-sharing FeO6 octahedra, forming dimers. The dimers share corners to form chains along [010]. The phosphate groups connect the chains to form sheets || {001}. [8]Pb act as a link for the sheets.


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Classification of CrimsoniteHide

Approved
Approval Year:
2015
First Published:
2015

Pronounciation of CrimsoniteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of CrimsoniteHide

Adamantine
Transparency:
Transparent
Colour:
deep red
Streak:
light purplish orange
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
likely on {101}
Fracture:
Irregular/Uneven, Splintery
Density:
5.180 g/cm3 (Calculated)

Optical Data of CrimsoniteHide

Type:
Biaxial (+)
RI values:
nα = 2.021 nβ = 2.026 nγ = 2.032
2V:
Measured: 85.5° (5)
Max Birefringence:
δ = 0.011
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Pleochroism:
Visible
Comments:
X light orange, Y light yellow, Z red brown
Comments:
Refractive indexes calculated from Gladstone-Dale relationship

Chemical Properties of CrimsoniteHide

Formula:
PbFe3+2(PO4)2(OH)2
Common Impurities:
As,Ca,(S,Zn,V,Al,Cu)

Crystallography of CrimsoniteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cccm
Setting:
Cccm
Cell Parameters:
a = 16.2535(13) Å, b = 7.4724(4) Å, c = 12.1533(9) Å
Ratio:
a:b:c = 2.175 : 1 : 1.626
Unit Cell V:
1476.04 ų
Z:
8
Morphology:
Blades or plates flattened on {100}, up to 0.1 mm
Twinning:
None

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.86(42)
4.53(45)
3.485(64)
3.190(100)
2.902(54)
2.502(77)
2.268(54)
1.781(39)
Comments:
From Type Description.

Type Occurrence of CrimsoniteHide

General Appearance of Type Material:
Subparallel aggregates of deep red blades or plates flattened on {100} and up to 0.1 mm in maximum dimension
Place of Conservation of Type Material:
Type material is deposited in the collections of the Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA, catalogue number 65558
Geological Setting of Type Material:
A low-temperature secondary mineral
Associated Minerals at Type Locality:

Synonyms of CrimsoniteHide

Relationship of Crimsonite to other SpeciesHide

Member of:
Other Members of this group:
CarminitePbFe3+2(AsO4)2(OH)2Orth. mmm (2/m 2/m 2/m) : Cccm
SewarditeCaFe3+2(AsO4)2(OH)2Orth. mmm (2/m 2/m 2/m) : Cccm

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for CrimsoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Adams, P.M., Mills, S.J. and Nash, B.P. (2015) Crimsonite, IMA 2014-095. CNMNC Newsletter No. 24, April 2015, page 249; Mineralogical Magazine, 79, 247-251.
Kampf, A.R., Adams, P.M., Mills, S.J., Nash, B.P. (2016): Crimsonite, PbFe3+2(PO4)2(OH)2, the phosphate analogue of carminite from the Silver Coin mine, Valmy, Nevada, USA. Mineralogical Magazine, 80: 925-935

Internet Links for CrimsoniteHide

Localities for CrimsoniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • Nevada
    • Humboldt Co.
      • Iron Point Mining District
        • Valmy
Kampf, A.R., Adams, P.M., Mills, S.J. and Nash, B.P. (2015) Crimsonite, IMA 2014-095. CNMNC Newsletter No. 24, April 2015, page 249; Mineralogical Magazine, 79, 247-251; Kampf, A.R., Adams, P.M., Mills, S.J., Nash, B.P. (2016): Crimsonite, PbFe3+2(PO4)2(OH)2, the phosphate analogue of carminite from the Silver Coin mine, Valmy, Nevada, USA. Mineralogical Magazine, 80, 925-935
 
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