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Rare secondary mineral in fahlore deposits.
The crystal structure is unknown. Unlike in the formula suggested in the original publication, the Sb is probably present in octahedral coordination as Sb(OH)6 or Sb(H2O)6 groups.
See also "genèvéite".
Visually similar to tyrolite.
Classification of Theisite
|IMA status:||Approved 1980|
|Strunz 8th edition ID:||7/B.18-10|
|Nickel-Strunz 10th (pending) edition ID:||8.BE.75|
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
E : With only medium-sized cations, (OH, etc.):RO4 > 2:1
|Dana 8th edition ID:||220.127.116.11|
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO4)pZq, where m:p > 4:1
|Hey's CIM Ref.:||24.2.5|
24 : Antimonates and Antimonites
2 : Antimonates of Be, Mg, Ca, Zn or Hg
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Type Occurrence of Theisite
|Type Locality:||Tuckerville prospects, Hinsdale Co., Colorado, USA|
|Year of Discovery:||1980|
Physical Properties of Theisite
Crystallography of Theisite
|Cell Parameters:||a = 8.22Å, b = 7.12Å, c = 14.97Å|
|Ratio:||a:b:c = 1.154 : 1 : 2.103|
|Unit Cell Volume:||V 876.14 Å³ (Calculated from Unit Cell)|
|X-Ray Powder Diffraction:|
Optical Data of Theisite
|RI values:||nα = 1.755 nβ = 1.785 nγ = 1.785|
|Maximum Birefringence:||δ = 0.030|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Surface Relief:||Very High|
|Dispersion:||distinct to strong|
Chemical Properties of Theisite
|Essential elements:||As, Cu, H, O, Zn|
|All elements listed in formula:||As, Cu, H, O, Sb, Zn|
Relationship of Theisite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Theisite
|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 Theisite
Williams, S. A. (1982): Theisite, a new mineral from Colorado. Mineralogical Magazine: 46: 49-50.
American Mineralogist (1983): 68: 282.
European Journal of Mineralogy (1995): 7: 1325.
Internet Links for Theisite
|Specimens:||The following Theisite specimens are currently listed for sale on minfind.com.|
Localities for Theisite
The 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.
(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.