Andradite-dem01b
(c) Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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Andradite
- Locality: Antetezambato (Tetezambato), Ambanja District, Diana (Northern) Region, Antsiranana Province, Madagascar (Locality at mindat.org)
- Size: thumbnail, 1.7x 1.7 x 1.5 cm
- Andradite var. Demantoid garnet
- A stunning thumbnail, one that rgabbed me amidst hundreds of simply "small specimes" I have seen, as a piece with balance and significance that shows best in this size range, and not just "a small rock." This piece features a large, glassy and gemmy, grass-green demantoid crystal, measuring 1.7 cm in length, framed by smaller crystals. All of them are perched on a natural little pedestal of matrix and the cluster is complete all around. MUCH BETTER in person.
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AndraditAndradit (Dana, 1868), chemický vzorec Ca3Fe23+(SiO4)3, je krychlový minerál ze skupiny granátu. Minerál byl nazván po brazilském politikovi, mineralogovi a básníkovi Josém Bonifáciu de Andrada e Silva (1763–1838). .. pokračovat ve čtení