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Skorpionite

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Formula:
Ca
 
3
Zn
 
2
(PO
 
4
)
 
2
(CO
 
3
)(OH)
 
2
· H
 
2
O
System:MonoclinicColour: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

IMA status:Approved 2005
Nickel-Strunz 10th (pending) edition ID:8.DO.45

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

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

Type Locality:Skorpion Mine, Rosh Pinah, Lüderitz District, Karas Region, Namibia
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:
TarbuttiteHydrozinciteGypsum

Physical Properties of Skorpionite

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

Crystallography of Skorpionite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
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)
Maximum Birefringence:δ = 0.057

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Skorpionite

Formula:
Ca
 
3
Zn
 
2
(PO
 
4
)
 
2
(CO
 
3
)(OH)
 
2
· H
 
2
O
Simplified for copy/paste:Ca3Zn2(PO4)2(CO3)(OH)2·H2O
Essential elements:C, Ca, H, O, P, Zn
All elements listed in formula:C, Ca, H, O, P, Zn

Relationship of Skorpionite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.DO.05Girvasite
NaCa
 
2
Mg
 
3
(PO
 
4
)
 
2
(H
 
2
PO
 
4
)(CO
 
3
)(OH)
 
2
· 4H
 
2
O
8.DO.10Voggite
Na
 
2
Zr(PO
 
4
)(CO
 
3
)(OH) · 2H
 
2
O
8.DO.15Peisleyite
Na
 
2
Al
 
9
[(P,S)O
 
4
]
 
8
(OH)
 
6
•28H
 
2
O
8.DO.20Perhamite
Ca
 
3
Al
 
7.7
Si
 
3
P
 
4
O
 
23.5
(OH)
 
14.1
· 8H
 
2
O
8.DO.20Krásnoite
Ca
 
3
Al
 
7.7
Si
 
3
P
 
4
O
 
23.5
(OH)
 
12.1
F
 
2
· 8H
 
2
O
8.DO.25Saryarkite-(Y)
Ca(Y,Th)Al
 
5
(SiO
 
4
)
 
2
(PO
 
4
,SO
 
4
)
 
2
(OH)
 
7
· 6H
 
2
O
8.DO.30Micheelsenite
(Ca,Y)
 
3
Al(HPO
 
4
,CO
 
3
)(CO
 
3
)(OH)
 
6
· 12H
 
2
O
8.DO.40Parwanite
(Na,K)(Mg,Ca)
 
4
Al
 
8
(PO
 
4
)
 
8
(CO
 
3
)(OH)
 
7
· 30H
 
2
O

Other Names for Skorpionite

Synonyms:
IMA2005-010
Other Languages:
German:Skorpionit
Simplified Chinese:水羟碳磷锌钙石

Other Information

Health Warning: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

Search Engines:
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  • External Links:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Localities for Skorpionite

    (TL) indicates type locality. ? 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
     
    • 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)
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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