Aventurine

Info: This variant of quartz is not found in crystals. Aventurine is often found in grain masses of colourless quartz, which crystal structure have little leaflets of mica. The reflection of the light in those leaflets gives the typical green colour of the aventurine.

Found: The most famous deposits of aventurine were found in India and in Egypt.

Crystal structure
Trigonal
Hardness
7
Colour
Green
Shine
Glass