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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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Boltwoodite from
Goanikontes Claim, Goanikontes, Arandis Constituency, Erongo Region, Namibia


05981450017866377003208.jpg
Boltwoodite, etc.

Goanikontes Claim, Goanikontes, Arandis Constituency, Erongo Region, Namibia
09017230017271921734380.jpg
Boltwoodite

Goanikontes Claim, Goanikontes, Arandis Constituency, Erongo Region, Namibia
03258410017272026087835.jpg
Boltwoodite

Goanikontes Claim, Goanikontes, Arandis Constituency, Erongo Region, Namibia
07080600017363777801538.jpg
Boltwoodite

Goanikontes Claim, Goanikontes, Arandis Constituency, Erongo Region, Namibia
05981450017866377003208.jpg
Boltwoodite, etc.

Goanikontes Claim, Goanikontes, Arandis Constituency, Erongo Region, Namibia
09017230017271921734380.jpg
Boltwoodite

Goanikontes Claim, Goanikontes, Arandis Constituency, Erongo Region, Namibia
03258410017272026087835.jpg
Boltwoodite

Goanikontes Claim, Goanikontes, Arandis Constituency, Erongo Region, Namibia
07525270017363649968247.jpg
Boltwoodite

Goanikontes Claim, Goanikontes, Arandis Constituency, Erongo Region, Namibia
03711960017271921791679.jpg
Boltwoodite, etc.

Goanikontes Claim, Goanikontes, Arandis Constituency, Erongo Region, Namibia
09017230017271921734380.jpg
Boltwoodite

Goanikontes Claim, Goanikontes, Arandis Constituency, Erongo Region, Namibia
03258410017272026087835.jpg
Boltwoodite

Goanikontes Claim, Goanikontes, Arandis Constituency, Erongo Region, Namibia
09087250017363777804751.jpg
Boltwoodite

Goanikontes Claim, Goanikontes, Arandis Constituency, Erongo Region, Namibia
Locality type:Claim
Classification
Species:Boltwoodite
Formula:(K,Na)(UO2)(SiO3OH) · 1.5H2O
Comments:Spherelike aggregates up to 3 cm in diameter have been found
Habit:Needles to 1 cm, as radial, compact spheres (rare)
Colour:yellow to orange-yellow
Luminescent properties:Reddish orange in longwave, no fluoresence in shortwave
Quality for species:Excellent - world class for species or very significant. (!!)
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Calcite82
Gypsum4
Weeksite3
Quartz2
Manganese Oxides2
Pyrolusite2
Coffinite1
Goethite1
Data
Mineral Data:Click here to view Boltwoodite data
Locality Data:Click here to view Goanikontes Claim, Goanikontes, Arandis Constituency, Erongo Region, Namibia
Photo GalleryView Gallery (169 photos)
Data Identifiers
Mindat Occurrence Record ID:45666
Long-form Identifier:1:3:45666:1
GUID (UUID V4):0
Nearest other occurrences of Boltwoodite
25.0km (15.5 miles) ⓘHusab Mine, Arandis Constituency, Erongo Region, Namibia
32.4km (20.1 miles) ⓘRössing uranium mine, Arandis Constituency, Erongo Region, Namibia
33.2km (20.6 miles) ⓘArandis, Arandis Constituency, Erongo Region, Namibia
References
Palfi, A.G, Wartha, R., Niedermayr, Gerhard, Jahn, Steffen (2001) Das Boltwoodit-Vorkommen von Goanikontes [The boltwoodite occurrence of Goanikontes]. In Namibia. Bode Verlag GmbH. p.126-135.
Windisch, W. (2014) An introduction to micromounting.
 
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