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Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Kobaltfahlerz

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Formula:
Cu6[Cu4(Fe,Zn)2]Sb4S13
A Co-bearing (and Bi-bearing) variety of tetrahedrite. Co reported to 4%.
Probably a mixture - a Co end-member of the tetrahedrite group is not known at present (2025), only Ni, Zn and Cd end-members.


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Unique IdentifiersHide

Mindat ID:
29626 (as Kobaltfahlerz)
3924 (as Tetrahedrite Subgroup)
Long-form identifier:
mindat:1:1:29626:9 (as Kobaltfahlerz)
mindat:1:1:3924:2 (as Tetrahedrite Subgroup)

Chemistry of KobaltfahlerzHide

Mindat Formula:
Cu6[Cu4(Fe,Zn)2]Sb4S13
Element Weights:
Element% weight
Cu38.489 %
Sb29.499 %
S25.248 %
Fe6.765 %

Calculated from ideal end-member formula.
Elements listed:
Cu, Fe, S, Sb, Zn - search for minerals with similar chemistry

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.

Internet Links for KobaltfahlerzHide

References for KobaltfahlerzHide

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