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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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Melanotekite from
Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden


02336780017769610186841.jpg
Melanotekite

Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden
08070470017770114698139.jpg
Melanotekite, etc.

Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden
03463570017769609396180.jpg
Melanotekite

Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden
06694950017272009926680.jpg
Melanotekite

Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden
02336780017769610186841.jpg
Melanotekite

Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden
06739120017769610675697.jpg
Melanotekite, etc.

Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden
08497980017769609378303.jpg
Melanotekite

Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden
06694950017272009926680.jpg
Melanotekite

Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden
02336780017769610186841.jpg
Melanotekite

Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden
00792190017770114705724.jpg
Melanotekite, etc.

Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden
01855840017770114703452.jpg
Melanotekite

Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden
06694950017272009926680.jpg
Melanotekite

Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden
Locality type:Mine
Classification
Species:Melanotekite
Formula:Pb2Fe23+(Si2O7)O2
Comments:Two samples is known with crystals, one at Riksmuseet, Stockholm and one at Bergsskolan, Filipstad, Sweden
Habit:Masses and veins only two sample known with prismatic crystals (se photo)
Colour:Greenish brown
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Common
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Hedyphane1
Hancockite1
Celsian1
Microcline1
- var Hyalophane1
Data
Mineral Data:Click here to view Melanotekite data
Locality Data:Click here to view Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden
Photo GalleryView Gallery (5 photos)
Data Identifiers
Mindat Occurrence Record ID:54046
Long-form Identifier:1:3:54046:5
GUID (UUID V4):0
Nearest other occurrences of Melanotekite
8.8km (5.5 miles) ⓘBolivia stope, Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden
9.3km (5.8 miles) ⓘLångban Mine, Långban Ore District, Filipstad, Värmland County, Sweden
12.4km (7.7 miles) ⓘHarstigen Mine, Pajsberg, Persberg ore district, Filipstad, Värmland County, Sweden
12.6km (7.8 miles) ⓘStora Pajsberg Mine, Pajsberg, Persberg ore district, Filipstad, Värmland County, Sweden
References
GFF 38, 437
Holtstam, D., Langhof, J. (1994) Hancockite from Jakobsberg, Filipstad, Sweden: the second world occurrence. Mineralogical Magazine, 58 (390) 172-174 doi:10.1180/minmag.1994.058.390.18
 
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