Amazonite
Variety KAlSi3O8
Also called Amazonstone
About it
Blue-green microcline, often streaked with white albite. Pikes Peak, Colorado, gives classic crystals paired with smoky quartz; also from Russia, Madagascar, and Brazil.
- Type
- Variety
- Group
- Microcline variety (feldspar)
- Formula
- KAlSi3O8
- Hardness (Mohs)
- 6–6.5
- Specific gravity
- 2.54–2.63
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Triclinic
- Colours
- blue-green, green, turquoise, often with white streaks
- Transparency
- translucent, opaque
- Cleavage and fracture
- perfect in two directions at nearly right angles; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.