Verplanckite

General Information:
 Chemical Formula:
Ba12(Mn++,Ti,Fe++)6[Si4O12](O,OH)2Cl9·3(H2O)
 Environment:
Near the contact between meta-sediments and biotite-bearing quartz diorite.
 IMA Status:
Approved IMA 1965
 Locality:
Big Creek - Rush Creek sanbornite deposit, 5 miles NE of Trimmer, Fresno Co., California.
 Name Origin:
Named for William E. VerPlanck (1916-1963), American geologist, California Division of Mines & Geology.
Physical Properties:
 Cleavage:
[1120] Good, [0001] Indistinct
 Color:
brownish yellow or brownish orange.
 Density:
3.52
 Habits:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Aggregates - Made of numer ous individual crystals or clusters.
 Hardness:
2.5-3 - Finger Nail-Calcite
 Luster:
Vitreous (Glassy)
 Streak:
light orange
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