Apophyllite crystals. Apophyllite is a general term for the three separate minerals fluorapophyllite,hydroxyapophyllite,and natroapophyllite. All apophyllites consist of hydrated calcium,potassium and sodium silicates,fluorides and hydroxides. The most common form has a tetragonal structure (shown centre). Apophyllite is a hydrothermal mineral found filling cavities in igneous rocks such as basalt | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wiersma, Dirk |
Taille de l’image : | 3447 px × 5100 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |