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Segerstromite

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About SegerstromiteHide

Formula:
Ca3(As5+O4)2[As3+(OH)3]2
Colour:
Colorless
Lustre:
Vitreous
Hardness:
Specific Gravity:
3.46
Crystal System:
Isometric
The first known crystalline compound that contains the As3+(OH)3 arsenite molecule.


Classification of SegerstromiteHide

Approved
Approval Year:
2014
First Published:
2018

Physical Properties of SegerstromiteHide

Vitreous
Transparency:
Transparent
Colour:
Colorless
Comment:
in transmitted light
Streak:
White
Hardness:
4½ on Mohs scale
Comment:
~4.5
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None observed
Fracture:
None observed
Density:
3.46 g/cm3 (Measured)    3.44(3) g/cm3 (Calculated)

Optical Data of SegerstromiteHide

Type:
Isotropic
RI values:
n = 1.731(5)
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
High

Chemical Properties of SegerstromiteHide

Formula:
Ca3(As5+O4)2[As3+(OH)3]2

Crystallography of SegerstromiteHide

Crystal System:
Isometric
Class (H-M):
2 3 - Tetartoidal
Space Group:
I21 3
Setting:
I21 3
Cell Parameters:
a = 10.7627(2) Å
Unit Cell V:
1246.71 ų
Z:
4
Morphology:
As tetrahedra, dodecahedra and in blocky aggregates.
Twinning:
None observed

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.351(34)
3.775(25)
3.389(82)
3.104(33)
2.875(100)
2.111(45)
1.905(27)
1.748(34)

Type Occurrence of SegerstromiteHide

General Appearance of Type Material:
A secondary mineral, as tetrahedra, dodecahedra (up to 0.50 × 0.50 × 0.50 mm), or in blocky aggregates.
Place of Conservation of Type Material:
Cotype material is deposited in the collections of the Mineral Museum of the University of Arizona, Tucson, Arizona, USA, catalogue number 19800 and with the RRUFF Project, deposition number R130753.
Empirical Formula of Type Material:
Ca2.98(AsO4)2.00[As(OH)3]2.00
Associated Minerals at Type Locality:
Reference:
Yang, H., Downs, R.T., Jenkins, R.A., Evans, S.H. (2018): Segerstromite, Ca3(As5+O4)2[As3+(OH)3]2, the first mineral containing As3+(OH)3, the arsenite molecule, from the Cobriza mine in the Atacama Region, Chile. American Mineralogist: 103: 1497–1501

Synonyms of SegerstromiteHide

Other InformationHide

Notes:
Insoluble in water or hydrochloric acid
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 SegerstromiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hexiong Yang, Benjamin N. Schumer, Robert A. Jenkins, J. Rueben Bautista, Robert T. Downs and Stanley H. Evans (2014) Segerstromite, IMA 2014-001. CNMNC Newsletter No. 20, June 2014, page 554; Mineralogical Magazine: 78: 549-558.
Yang, H., Downs, R.T., Jenkins, R.A., Evans, S.H. (2018): Segerstromite, Ca3(As5+O4)2[As3+(OH)3]2, the first mineral containing As3+(OH)3, the arsenite molecule, from the Cobriza mine in the Atacama Region, Chile. American Mineralogist: 103: 1497–1501.

Internet Links for SegerstromiteHide

Localities for SegerstromiteHide

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.
Chile (TL)
 
  • Atacama Region
    • Copiapó Province
      • Pabellón
        • Chinchado-Sacramento district
Hexiong Yang, Benjamin N. Schumer, Robert A. Jenkins, J. Rueben Bautista, Robert T. Downs and Stanley H. Evans (2014) Segerstromite, IMA 2014-001. CNMNC Newsletter No. 20, June 2014, page 554; Mineralogical Magazine, 78, 549-558; Yang, H., Downs, R.T., Jenkins, R.A., Evans, S.H. (2018): Segerstromite, Ca3(As5+O4)2[As3+(OH)3]2, the first mineral containing As3+(OH)3, the arsenite molecule, from the Cobriza mine in the Atacama Region, Chile. American Mineralogist: 103: 1497–1501
Mineral and/or Locality  
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