Russian Natrolite Tumbles
$1.99
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Russian natrolite is a rare sodium aluminum silicate mineral that's part of the zeolite group. It's usually white or colorless, but can also be reddish, yellowish, gray, brown, green, or bluish Hardness: 5–5.5 on the Mohs scale Crystal structure: Orthorhombic or pseudo-tetragonal Luster: Vitreous, pearly, or silky Transparency: Transparent to opaque Specific gravity: 2.2 Average size: .5 inches
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