Snowflake obsidian pebble. Obsidian is an igneous volcanic rock formed by the rapid cooling of granitic magma. Its black colour is due to the presence of small amounts of iron. Snowflake obsidian contains inclusions of white radial cristobalite clusters,a form of quartz | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / TH FOTO-WERBUNG |
Taille de l’image : | 4441 px × 3164 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |