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Skorpionite

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Formula:
Ca3Zn2(PO4)2(CO3)(OH)2 · H2O
System:
Monoclinic
Colour:
colourless
Hardness:
Name:
For the type locality at the Skorpion Mine, Rosh Pinah, Lüderitz District, Karas Region, Namibia.
May be confused with sword-shaped crystals of scholzite.

Classification of Skorpionite

Approved 2005
8.DO.45

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
O : With CO3, SO4, SiO4
43.5.20.

43 : COMPOUND PHOSPHATES, ETC.
5 : Hydrated Compound Phosphates, etc·, Containing Hydroxyl or Halogen
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Type Occurrence of Skorpionite

General Appearance of Type Material:
colourless needle-like crystals elongated parallel to [001]
Place of Conservation of Type Material:
Mineralogical Institute, University of Bochum, Germany
Associated Minerals at Type Locality:

Physical Properties of Skorpionite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
colourless
Streak:
white
Hardness (Mohs):
Hardness Data:
Measured
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
3.15(3) g/cm3 (Measured)    3.17 g/cm3 (Calculated)

Crystallography of Skorpionite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 19.042(2) Å, b = 9.309(1) Å, c = 6.519(1) Å
β = 92.72(1)°
Ratio:
a:b:c = 2.046 : 1 : 0.7
Unit Cell Volume:
V 1154.3 ų
Z:
4
Morphology:
Bladed, sword-shaped.
Comment:
refined from X-ray powder data

Optical Data of Skorpionite

Type:
Biaxial (-)
RI values:
nα = 1.588(10) nβ = 1.645 nγ = 1.646(10)
2V:
Measured: 15.0° (5)
Max Birefringence:
δ = 0.057
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Skorpionite

Formula:
Ca3Zn2(PO4)2(CO3)(OH)2 · H2O
Essential elements:
All elements listed in formula:

Relationship of Skorpionite to other Species

8.DO.05GirvasiteNaCa2Mg3(PO4)3(CO3)(H2O)6
8.DO.10VoggiteNa2Zr(PO4)(CO3)(OH) · 2H2O
8.DO.15PeisleyiteNa2Al9[(P,S)O4]8(OH)6•28H2O
8.DO.20PerhamiteCa3Al7.7Si3P4O23.5(OH)14.1 · 8H2O
8.DO.20KrásnoiteCa3Al7.7Si3P4O23.5(OH)12.1F2 · 8H2O
8.DO.25Saryarkite-(Y)Ca(Y,Th)Al5(SiO4)2(PO4,SO4)2(OH)7 · 6H2O
8.DO.30Micheelsenite(Ca,Y)3Al(HPO4,CO3)(CO3)(OH)6 · 12H2O
8.DO.40Parwanite(Na,K)(Mg,Ca)4Al8(PO4)8(CO3)(OH)7 · 30H2O

Other Names for Skorpionite

Name in Other Languages:
German:Skorpionit
Simplified Chinese:水羟碳磷锌钙石

Other Information

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 Skorpionite

Reference List:
Borg, G., Karner, K., Buxton, M., Armstrong, R., Schalk van der Merwe, W. (2003) Geology of the Skorpion supergene zinc deposit, southern Namibia. Economic Geology, 98, 749-771.

Jahn, S. (2007) Tarbuttit von der Skorpion Zink Mine, Namibia. Mineralien-Welt 18 (4), 56-66. (in German)

Krause, W., et al. (2008) Skorpionite, a new mineral from Namibia: description and crystal structure. Eur. J. Mineralogy 20, 271-280.

Internet Links for Skorpionite

Localities for Skorpionite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Namibia (TL)
 
  • Karas Region
    • Lüderitz District
      • Rosh Pinah
Krause, W., et al.: "Skorpionite, a new mineral from Namibia: description and crystal structure", Eur. J. Mineralogy 20, 271-280 (2008); Borg, G., Karner, K., Buxton, M., Armstrong, R., Schalk van der Merwe, W. (2003): Geology of the Skorpion supergene zinc deposit, southern Namibia. Economic Geology, 98, 749-771.; Jahn, S. (2007): Tarbuttit von der Skorpion Zink Mine, Namibia. Mineralien-Welt 18 (4), 56-66. (in German)
Mineral and/or Locality  
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