Specimen #550
Name: Benstonite on Fluorite with Bitumen
Type: Mineral
Locality: Cave-in-Rock District, Hardin County, Illinois, USA
Favorite? N
Fluorescent? N
Size: 7x5x2.5 cm.
Weight: 114
Acquired: 2008-01-22
Source: John Betts
Label: Y
Comment: Rhombohedral white benstonite crystals up to 4 mm on translucent cubic yellow fluorite crystals up to 20 mm across with remnants of black bitumen (natural petroleum) in crevices of the fluorite. No damage. Size of individual crystals: 1-20 mm.
Minerals: Benstonite ((Ba,Sr)6(Ca,Mn)6Mg(CO3)13) Fluorite (CaF2)
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