Yugawaralite

Formula: CaAl₂Si₆O₁₆·4H₂O
Mineral class: silicates
Crystal system: monoclinic
Mohs scale: 4.5 - 5
Density (g/cm³): 2.20 - 2.23
Refractive index: 1.490 - 1.509
Cleavage: distinct - imperfect
Colors: colorless, white, orange-pinkish
Transparency: transparent - translucent
Luster: vitreous - pearly
Fluorescence: -
Pleochroism: -
Largest crystal: 8 cm?
Deposits: worldwide
Discovery: 1952
1st Description: 1952 (Sakurai & Hayashi)
Name: from the type locality Yugawara Onsen / Yugawara / Kanagawa Prefecture / Kanto Region / Honshu Island / Japan

Yugawaralite Mineral

Size: 5.2 x 4.0 x 3.4 cm

Origin: Khandivali / Mumbay / India

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Yugawaralite Mineral

Longest crystal: 0.1 cm

Origin: 200/237 Road Quarry / Wolf Point / Cowlitz County / Washington / USA

Photo by kind permission of © Saul Krotki

Yugawaralite

Weight: 0.82 ct

Origin: India

Photo by kind permission of © www.rocklogic.biz

Yugawaralite Mineral

Size of the crystal: 1 cm

Origin: Poona Distr. / Maharashtra / India

Photo by kind permission of © www.cfm-minerals.it