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Whiteite-(CaMgMg)

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Formula:
CaMg3Al2(PO4)4(OH)2·8H2O
Colour:
Colourless
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
2.48
Crystal System:
Monoclinic
Chemically similar to angastonite, montgomeryite, and overite.
A low temperature, secondary mineral formed as a result of hydrothermal alteration.


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Classification of Whiteite-(CaMgMg)Hide

Approved
Approval Year:
2016
First Published:
2016

Physical Properties of Whiteite-(CaMgMg)Hide

Vitreous
Transparency:
Transparent
Colour:
Colourless
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
on {001}
Density:
2.48 g/cm3 (Measured)    2.477 g/cm3 (Calculated)

Optical Data of Whiteite-(CaMgMg)Hide

Type:
Biaxial (+)
RI values:
nα = 1.564(1) nβ = 1.565(1) nγ = 1.575(1)
2V:
Measured: 24° (1), Calculated: 35.3°
Max Birefringence:
δ = 0.011
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
None obeserved
Pleochroism:
Non-pleochroic

Chemical Properties of Whiteite-(CaMgMg)Hide

Formula:
CaMg3Al2(PO4)4(OH)2·8H2O
IMA Formula:
CaMg3Al2(PO4)4(OH)2 · 8H2O

Crystallography of Whiteite-(CaMgMg)Hide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Setting:
P2/a
Cell Parameters:
a = 14.824(2) Å, b = 7.0302(3) Å, c = 9.946(3) Å
β = 110.115(12)°
Ratio:
a:b:c = 2.109 : 1 : 1.415
Unit Cell V:
973.3 ų
Z:
2
Morphology:
As tapering blades, elongated parallel to [100] and flattened on {001}, commonly forming radial fans on fracture surfaces. Forms observed:{100}, {010}, {001},{11-1} and {13-1}

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.20(82)
4.88(64)
3.510(35)
2.936(40)
2.849(45)
2.805(100)
2.549(34)
1.953(35)

Type Occurrence of Whiteite-(CaMgMg)Hide

Place of Conservation of Type Material:
Cotypes: Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA (catalogue numbers 65642 and
65643)
Chemical Analysis of Type Material:
CaO8.18 %
MgO16.47 %
FeO0.13 %
Al2O313.35 %
P2O538.84 %
H2O22.32 %
Total:99.29 %
Geological Setting of Type Material:
Hydrothermally altered phosphate nodules from the lower Candelaria Formation
Associated Minerals at Type Locality:
Reference:
Kampf, A.R., Adams, P.M. and Nash, B.P. (2016) Whiteite-(CaMgMg),CaMg3Al2(PO4)4(OH)2·8H2O, a New Jahnsite-group Mineral from the Northern Belle Mine, Candelaria, Nevada, U.S.A. Canadian Mineralogist. 54: 1513-1523

Synonyms of Whiteite-(CaMgMg)Hide

Relationship of Whiteite-(CaMgMg) to other SpeciesHide

Other Members of this group:
Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2OMon.
Whiteite-(CaFeMg){Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m
Whiteite-(CaMnMn){Ca}{Mn2+}{Mn2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
Whiteite-(MnFeMg){(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
Whiteite-(MnMnMg)MnMnMg2Al2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b

Fluorescence of Whiteite-(CaMgMg)Hide

None observed under SW or LW ultraviolet light

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 Whiteite-(CaMgMg)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Adams, P.M. and Nash, B.P. (2016) Whiteite-(CaMgMg), IMA 2016-001. CNMNC Newsletter No. 31, June 2016, page 694; Mineralogical Magazine: 80: 691–697
Kampf, A.R., Adams, P.M. and Nash, B.P. (2016) Whiteite-(CaMgMg),CaMg3Al2(PO4)4(OH)2·8H2O, a New Jahnsite-group Mineral from the Northern Belle Mine, Candelaria, Nevada, U.S.A. Canadian Mineralogist. 54: 1513-1523. doi:10.3749/canmin.1600051

Internet Links for Whiteite-(CaMgMg)Hide

Localities for Whiteite-(CaMgMg)Hide

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
    • Mineral Co.
      • Candelaria District
Kampf, A.R., Adams, P.M. and Nash, B.P. (2016) Whiteite-(CaMgMg), IMA 2016-001. CNMNC Newsletter No. 31, June 2016, page 694; Mineralogical Magazine: 80: 691–697; Kampf, A.R., Adams, P.M. and Nash, B.P. (2016) Whiteite-(CaMgMg),CaMg3Al2(PO4)4(OH)2·8H2O, a New Jahnsite-group Mineral from the Northern Belle Mine, Candelaria, Nevada, U.S.A. Canadian Mineralogist. 54: 1513-1523.
Mineral and/or Locality  
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