RockVault
Clinochlore

Image: <bdi><a href="https://www.wikidata.org/wiki/Q108103612" class="extiw" title="d:Q108103612"><span title="Wikipedian and OpenStreetMap mapper from Cologne, Open Data activist">Raimond Spekking</span></a></bdi> (CC BY-SA 4.0)

monocliniccommonsilicates

Clinochlore

(Mg,Fe)5Al(Si3Al)O10(OH)8

This specimen displays dark green to black, platy to foliated aggregates of clinochlore crystals, showing a somewhat pearly luster on its surfaces.

Clinochlore Physical Properties

Mohs Hardness

2

Crystal System

monoclinic

Luster

vitreous

Streak Color

white to greenish white

Cleavage

perfect on {001}

Fracture

uneven

Specific Gravity

2.65

Colors

dark green, green, black, yellowish green, white, pink, purple

Transparency

transparent to translucent

Type Locality

Totenköpfe, Stubachtal, Hohe Tauern, Salzburg, Austria

Mineral Group

silicates

Uses

collector, minor industrial applications

Associated Minerals

quartz, feldspar, epidote, actinolite, garnet, magnetite, talc, serpentine

Rarity

common

Geological Context

Clinochlore is a common metamorphic mineral, typically forming in low- to medium-grade metamorphic rocks like greenschists and chlorite schists. It also occurs as a hydrothermal alteration product in igneous rocks.