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yellow and brown
Mined in Norway
Tourmaline is unusual in that it is both pyroelectric and piezoelectric
Opals are hydrated amorphous forms of silica
Dendritic Opal 3x6mm Heishi - 15-16 Inch 7x13mm yellow and brownThis variety of opal is named "dendritic" for the small inclusions within it that resemble moss or ferns. These inclusions consist of iron, manganese and other metallic oxides captured during the forming of the rock. Opals are hydrated amorphous forms of silica, created when silica hardens within the fissures of other stones.
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