Aventurine

About it

Quartz rock that glitters from tiny flat inclusions, usually green fuchsite mica, or hematite in orange kinds. Mostly from India; the man-made glass called goldstone imitates its sparkle.

Type

Variety

Group

Quartz variety

Formula

SiO2

Hardness (Mohs)

6.5–7

Specific gravity

2.64–2.69

Streak

white

Lustre

vitreous (glassy)

Crystal system

Trigonal

Colours

green, blue, orange, red-brown, cream

Transparency

translucent, opaque

Cleavage and fracture

none; conchoidal fracture

Typical values: real specimens vary. For more, see mindat.org.