Scolecite,calcium aluminum silicate,is a member of the large and diverse zeolite group of minerals. As with all zeolites,a typical occurrence is in cavities in dark volcanic rocks such as basalt. Such rocks cover large areas in Brazil,India and elsewhere. Scolecite usually occurs in radiating sprays of tiny prismatic crystals. However at Rio Grande do Sul,in Brazil,the crystals are exceptionally large,reaching a length of several inches | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Arem, Joel |
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