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427. Thomsonite. Crystaline

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Dana number

77.1.5.9

Chemical formula

(Ca,Sr)₂NaAl₅Si₅O₂₀.6H₂O

Crystal class

Orthorhombic

Mohs hardness

5-5.5

Specific gravity

2.25-2.44

Collected in

Poona, India

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