Phlogopite
Mineral KMg3(AlSi3O10)(F,OH)2
Also called Amber mica and Bronze mica
Take care.
- Fragile: Handle it gently and pack it well; it breaks or crumbles easily.
About it
Amber to copper-brown magnesium mica of marble and ultramafic rock, often with a coppery sheen; large crystals come from the Grenville marbles of Ontario and Quebec, and from Madagascar.
- Type
- Mineral
- Group
- Silicate (phyllosilicate), mica group
- Formula
- KMg3(AlSi3O10)(F,OH)2
- Hardness (Mohs)
- 2–3
- Specific gravity
- 2.78–2.85
- Streak
- white
- Lustre
- pearly, submetallic
- Crystal system
- Monoclinic
- Colours
- yellow-brown, amber, copper brown, green, colourless
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect in one direction, flexible elastic sheets
Typical values: real specimens vary. For more, see mindat.org.