Fuchsite
Variety K(Al,Cr)2(AlSi3O10)(OH)2
Also called Chrome mica and Chromian muscovite
About it
Bright green muscovite mica coloured by chromium, as glittering flakes or soft massive pieces. It gives green aventurine its sparkle and is the green host in ruby-in-fuchsite from India.
- Type
- Variety
- Group
- Muscovite variety (mica)
- Formula
- K(Al,Cr)2(AlSi3O10)(OH)2
- Hardness (Mohs)
- 2.5–3
- Specific gravity
- 2.77–2.88
- Streak
- white
- Lustre
- pearly, vitreous (glassy)
- Crystal system
- Monoclinic
- Colours
- bright green, emerald green
- Transparency
- translucent, opaque
- Cleavage and fracture
- perfect basal; flexible, elastic flakes
Typical values: real specimens vary. For more, see mindat.org.