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Mineralpedia Details for Lawsonite

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Lawsonite

Lawsonite

Named after Professor Andrew Cowper Lawson, a Scottish-American geologist at the University of California in the United States. Lawsonite is an uncommon mineral that occurs at high pressures and low temperatures in regionally metamorphosed, low-grade, glaucophane-bearing schists. It can also form from plagioclase during its alteration to saussurite in gabbro and diabases and can be found rarely in eclogite. Localities include in the USA, localities in the French-Italian Alps, Turkey, Japan, New Caledonia, and on Celebes Island.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/lawsonite.pdf

Formula
CaAl2Si2O7(OH)2┬ĚH2
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 
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Lawsonite from Reed Station, Tiburon Peninsula, Marin Co., California, United States

Lawsonite
            from Reed Station, Tiburon Peninsula, Marin Co., California, United States

Light purplish well formed Lawsonite crystals to 5mm richly covering the top side of green Glaucophanitic-Schist matrix.

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