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UM1992-02-BOCO:CaHMgNa

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Formula:
Na-(MgCa)-B-C-O-H
Colour:
colourless
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
2.15
Crystal System:
Orthorhombic
Possibly a hydrated borate carbonate of either Na or Na-Mg-Ca.

Present as disseminated crystal inclusions, up to 10 x 30 x 100 microns in size, in borax and kernite.

Forms euhedral, tabular crystals, flattened on {010} and bounded by {101}, with minor {100} forms; elongated on [101], to equant tabular.


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Classification of UM1992-02-BOCO:CaHMgNaHide

Notes:
Unnamed (probably valid)

Physical Properties of UM1992-02-BOCO:CaHMgNaHide

Vitreous
Transparency:
Transparent
Colour:
colourless
Hardness:
Cleavage:
Perfect
{010} and {101}
Density:
2.15 g/cm3 (Measured)    

Optical Data of UM1992-02-BOCO:CaHMgNaHide

Type:
Biaxial (+)
RI values:
nα = 1.503(1) nβ = 1.523(1) nγ = 1.559(1)
2V:
Measured: 75°
Max Birefringence:
δ = 0.056
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r < v
Comments:
orientation: Z = a, X = b, Y = c

Chemical Properties of UM1992-02-BOCO:CaHMgNaHide

Formula:
Na-(MgCa)-B-C-O-H

Crystallography of UM1992-02-BOCO:CaHMgNaHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pccm
Setting:
Pccm
Cell Parameters:
a = 9.85(2) Å, b = 13.54(2) Å, c = 8.01(2) Å
Ratio:
a:b:c = 0.727 : 1 : 0.592
Unit Cell V:
1,068.29 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.94Å(100)
3.95Å(60)
3.83Å(50)
3.54Å(80)
3.32Å(80)
2.10Å(60)
2.04Å(50)
1.92Å(50)
1.85Å(50)

Other InformationHide

Notes:
soluble, with effervescence, in 1:1 HCl; strong reaction for B
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 UM1992-02-BOCO:CaHMgNaHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Aristarain, L.F. (1992): A new hydrated borate-carbonate from Tincalayu, Salta, Argentina. Revista del Museo de La Plata: 11(103): 57-64 (in Spanish, with English abs.); in: Jambor, J.L., Roberts, A.C. (1995): New mineral Names. American Mineralogist: 80: 187
Smith, D.G.W., Nickel, E.H. (2007): A System of Codification for Unnamed Minerals: Report of the SubCommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification. Canadian Mineralogist: 45: 983-1055; http://nrmima.nrm.se (2016)

Internet Links for UM1992-02-BOCO:CaHMgNaHide

Localities for UM1992-02-BOCO:CaHMgNaHide

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.
Argentina
 
  • Salta Province
    • Los Andes department
      • Salar del Hombre Muerto
Aristarain, L.F. (1992): A new hydrated borate-carbonate from Tincalayu, Salta, Argentina. Revista del Museo de La Plata: 11(103): 57-64 (in Spanish, with English abs.); in: Jambor, J.L., Roberts, A.C. (1995): New mineral Names. American Mineralogist: 80: 187
 
Mineral and/or Locality  
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