| Crystal System |
Monoclinic & Triclinic |
| Chemical Comp.. |
(Mg,Al,Mn,Fe2+Fe3+)12[(Si,Al)8O20](OH)16 |
| Color |
Colorless
or Green |
| Pleochroism |
Weak
to Moderate Green |
| Cleavage |
1
perfect |
| Relief |
Moderate |
| Birefringence |
Low (gray/white): anomalous brown and
blue |
| 2V | -20˚ to +60˚ |
| Optic Sign | Negative or Positive |
| Twinning |
Simple |
Chlorite
(Ch) exhibits weak pleochroism (green): the photomicrograph on the
right is rotated 90˚ from the one on the left. Chlorite on the right
has a weaker color than in the photomicrograph on the left. Also
shown are opaque minerals (Op), Clinozoisite (Cz), and Quartz (Qz)
Chlorite exhibits low birefringence (grays to white), which is occasionally anomalously brown (shown on the right ) or a dark blue.
Chlorite exhibits low birefringence (grays to white), which is occasionally anomalously brown (shown on the right ) or a dark blue.