Chamosite 17.77 ct

Chamosite
17.77 ct
Trillion Cut
17.50 x 17.50 mm
Keweenaw Co,
Michigan.
USA
T182

Chamosite is a fascinating mineral belonging to the chlorite group. It is the iron-rich end member of the series, with Clinochlore being the magnesium-rich counterpart¹². Here are some key details about Chamosite:

• Chemical Composition: Its formula is (Fe₂₊,Mg)₅Al₂Si₃O₁₀(OH)₈¹.
• Color: It typically appears in shades of green, gray-green, black, or brown²³.
• Crystal System: Chamosite crystallizes in the monoclinic system¹.
• Hardness: It has a Mohs hardness of 2.5 to 3, making it relatively soft¹.
• Luster: The mineral exhibits a vitreous to pearly luster¹.
• Transparency: Chamosite is generally translucent¹.
• Occurrence: It forms in low-to-moderate-grade metamorphosed iron deposits and is often found as gray or black crystals in oolitic iron ore