Biachellaite

biachellaite

sanidine

leucite

hauyne

Images

Formula: (Na,Ca,K)₈(Si₆Al₆O₂₄)(SO₄)₂(OH)_0.5.H₂O
Tectosilicate, feldspathoid, cancrinite group
Crystal System: Trigonal
Specific gravity: 2.51 measured, 2.515 calculated
Hardness: 5
Streak: White
Colour: Colourless
Environments

Volcanic igneous environments

Localities

At the type locality, the Biachella Valley, Sacrofano, Metropolitan City of Rome Capital, Lazio, Italy, biachellaite is found in as equant dipyramidal crystals up to 1 cm in size in cavities in volcanic ejecta. Associated minerals include sanidine, diopside, andradite, leucite and hauyne (HOM, Mindat).

Biachellaite from the Biachella valley - Image

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