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Name: |
laumontite |
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Class: |
Silicates |
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Chemistry: |
Ca(AlSi2O6)2* 4 H2O Hydrous Calcium Aluminum Silicate |
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Color(s): |
white, yellow, reddish, colorless |
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Hardness: |
3 - 3.5 |
SpecGrav: |
2.25 - 2.4 |
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Fracture: |
uneven |
Cleavage: |
complete |
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Crystal: |
monoclinic (columnar, vertically striped) |
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Envronment: |
occasionally found in veins of ore, often in metamorphic rocks or magmatites in pore space or crevices. |
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Association: |
calcite, heulandite, stilbite, analcite, albite, chlorite, quartz |
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Locals: |
Germany | Italy | New Jersey, Calif., Georgia/USA |
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Misc: |
Soluble in hydrochloric acid, the mineral is named for Francois Nicholas Pierre Gillet De Laumont, who discovered the first specimens in the cliffs of Brittany. Laumontite will dehydrate when exposed to the air, so crystals are often coated with a sealant to protect them. |
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Photos |
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1.) Genstar Quarry, Churchville, Ga. |
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