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0 item @ $0.00  

Lawsonite

#PD36617

Lawsonite

#PD36617
Availability
Sold
Size
10 x 5.5 x 5 cm - Cabinet 
Formula
CaAl2Si2O7(OH)2·H2O (RRUFF)
Locality
near Valley Ford, Sonoma Co., California, United States

Slender to thick prismatic slightly blue to grey crystals to 1cm. The crystals show "striations" and internal basal cleavages, which is consistent with the descriptions. Lawsonite is abundant in the coast range of California. It is a good indicator of high pressure and low temperature metamorphic regimes occuring typically in glaucophane schist and converts to Anorthite at high temperatures.

Although a dirty looking specimen, the crystals are good and the older tag accompanied with the specimen is ex-Paul Moore.

Lawsonite

Formula
CaAl2Si2O7(OH)2·H2
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Tabular 
Cleavage
Perfect, Perfect, Poor 
Luster
Vitreous - Greasy 
Color
colorless, white, gray, blue, pinkish 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Uneven 
Hardness
7.5 

Data courtesy of Webmineral.

Collection
Phillips Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Lawsonite
On Dakota Matrix
Other Available Lawsonite
WebMineral
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Mindat
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