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Pararaisaite

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About PararaisaiteHide

Formula:
CuMg[Te6+O4(OH)2]·6H2O
Colour:
deep blue
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.85
Crystal System:
Monoclinic
A dimorph of raisaite.


Classification of PararaisaiteHide

Approved
Approval Year:
2018

Physical Properties of PararaisaiteHide

Vitreous
Transparency:
Transparent
Colour:
deep blue
Streak:
white
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {001} and good on {100}.
Fracture:
Splintery
Density:
2.85(2) g/cm3 (Measured)    

Optical Data of PararaisaiteHide

Type:
Biaxial (+)
RI values:
nα = 1.600(2) nβ = 1.616(2) nγ = 1.713(3)
2V:
Measured: 47° (1)
Max Birefringence:
δ = 0.113
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
slight r > v
Comments:
X very pale purple, Y purple, Z blue green (X << Z < Y)
Comments:
Z = b, X ≈ a, Y ≈ c

Chemical Properties of PararaisaiteHide

Formula:
CuMg[Te6+O4(OH)2]·6H2O

Crystallography of PararaisaiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 9.6838(5) Å, b = 5.7517(2) Å, c = 17.634(1) Å
β = 90.553(6)°
Ratio:
a:b:c = 1.684 : 1 : 3.066
Unit Cell V:
982.14 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.77(100)
4.824(71)
4.392(43)
4.248(85)
2.733(39)
2.419(50)
1.893(48)
1.753(29)

Occurrences of PararaisaiteHide

Paragenetic Mode(s):
•  Oxidation

Type Occurrence of PararaisaiteHide

General Appearance of Type Material:
Deep blue, striated prisms up to 0.4 mm in length.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Blvd, Los Angeles, California, USA, catalogue number 67272
Associated Minerals at Type Locality:

Synonyms of PararaisaiteHide

Common AssociatesHide

BaryteBaSO4
GoldfielditeCu10Te4S13

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 PararaisaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Housley, R.M. and Rossman, G.R. (2018) Pararaisaite, IMA 2017-110. CNMNC Newsletter No. 42, April 2018, page 449; Mineralogical Magazine: 82: 445-451
Kampf; A.R., Housley, R.M., Rossman, G.R. (2018): Pararaisaite, the Dimorph of Raisaite, from the North Star Mine, Tintic, Utah, Usa. Canadian Mineralogist, 56, 811-820.

Internet Links for PararaisaiteHide

Localities for PararaisaiteHide

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)
 
  • Utah
    • Juab Co.
      • East Tintic Mts
        • Tintic District
          • Mammoth
            • Mammoth Peak
Kampf, A.R., Housley, R.M. and Rossman, G.R. (2018) Pararaisaite, IMA 2017-110. CNMNC Newsletter No. 42, April 2018, page 449; Mineralogical Magazine: 82: 445-451
Mineral and/or Locality  
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