Ilvaite

Ilvaiet, Ilvait, Ilvaít, Ilvaita, Ilvaitas, Ільваїт, Ильваит, 珪灰鉄鉱, 黑柱石, อิลวาไอต์, אילוואיט

Commonly known rarer (so called collectors stones) very rare (rarities) relatively rare organic material

Formula: CaFe₂²⁺Fe³⁺OSi₂O₇(OH)
Mineral class: silicates
Crystal system: orthorhombic or monoclinic
Mohs scale: 5.5 - 6
Density (g/cm³): 3.99 - 4.05
Refractive index: 1.727 - 1.883
Cleavage: good
Colors: black
Luster: submetallic
Fluorescence: -
Pleochroism: strong. X: dark green, Y: brown, Z: brown
Largest crystal: 25 cm?
Deposits: worldwide
Discovery: 1811
1st Description: 1811
Name: after the Latin word for the Italian island Elba (Ilva), the type locality

Ilvaite Mineral

Size: 3.4 x 1.2 x 0.9 cm

Origin: Koundouro / Serifos Island / Aegean Isl. Pref. / Greece

Photo by kind permission of © www.irocks.com

⇐ Intro Page ⇐ Gemstones