Serpentinite
Image: <a href="//commons.wikimedia.org/w/index.php?title=User:Ronald_Werner&action=edit&redlink=1" class="new" title="User:Ronald Werner (page does not exist)">Ronald Werner</a> (CC BY-SA 4.0)
Mineral NameSerpentinite
Chemical Formula(Mg,Fe)3Si2O5(OH)4
Mohs Hardness2.5
Crystal Systemmonoclinic
Streak Colorwhite
Cleavagenone to poor
Fractureuneven
Specific Gravity2.6
Colorsdark green, greenish-black
Transparencyopaque
Type LocalityNorway
Mineral GroupSilicates
Usesarchitectural stone, carving material, decorative stone
Associated Mineralsolivine, pyroxene, magnetite, talc
Raritycommon
Description
A large, dark green to greenish-black massive rock specimen with a somewhat dull to greasy luster, displaying an irregular, rounded shape.
Geological Context
Serpentinite is a metamorphic rock formed by the hydrothermal alteration of ultramafic igneous rocks like peridotite and dunite, often found in ancient ocean crust and mantle sections.
