Chemical Formula: SiO2

Chemical Name: Silicon Dioxide

Mineral Class: Tectosilicate

Mineral Notes: Chalcedony is a microcrystalline variety of quartz occurring as botryoidal masses. The mineral typically forms in rock cavities at low temperatures as a precipitate from aqueous silica-rich solutions.

Description: An almost white matrix containing a deep cavity. This is lined with well-formed pyramidal Quartz crystals which are themselves covered by a thin film of transluscent Chalcedony. The effect is very attractive.

Location: Sid Rahhal, Morocco.