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413. Heulandite. Crystaline

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Dana number

77.1.4.1

Chemical formula

(Ca,Na,K)_2-3Al₃(Al,Si)₂Si₁₃O₃₆.12H₂O

Crystal class

Monoclinic

Mohs hardness

3.5-4

Specific gravity

2.10-2.29

Collected in

Nasik, India

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