$38.00
M207: Biotite Mica – Locality: Madagascar. Selection: Rough specimen.
Appearance: This naturally black “book” has a smooth, shiny surface, and iridescent displays with rotated under light.
Please Note: display photos are shot under various light settings.
Approximate measurements: LxWxH – 4″ x 1/2″ x 4.
Availability: single specimen, exclusive.
In stock
Biotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks. These include annite, phlogopite, siderophyllite, fluorophlogopite, fluorannite, eastonite, and many others. These micas vary in chemical composition but are all sheet silicate minerals with very similar physical properties.
| Weight | .75 lbs |
|---|---|
| Dimensions | 4 × .5 × 4 in |
