Yugawaralite Value, Price, and Jewelry Information

By Chris857 (Own work) [CC-BY-SA-3.0], via Wikimedia Commons

An overview on Yugawaralite Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Yugawaralite.

Yugawaralite Value

The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.

Yugawaralite Information

Is a Variety ofZeolite
Crystallography Monoclinic: crystals tabular and very flat.
Refractive Index 1.495-1.504
Colors Colorless to white.
Luster Vitreous.
Fracture Conchoidal
Hardness 4.5
Specific Gravity 2.23-2.25.
Birefringence 0.009
Cleavage Imperfect
Stone SizesSuperb, Well-formed, colorless, transparent crystals up to 3 cm long occur at the Khandivali Quarry, Bombay, India, with physical properties close to the literature values for the mineral. A few colorless faceted gemstones have been cut from this exceptional and extremely rare material.
Luminescence None reported.
Absorption Spectrum None.
FormulaCaAl2Si6O16 · 4H2O.
Pleochroism None.
Optics = 1.495; β = 1.497; γ = 1.504. Biaxial (+).

Optics: a=1.495; β= 1.497; γ=1:504.

Biaxial (+).

Occurrence: In veins and crystals in volcanic rocks in Japan and in huge crystals in breccia cavities in India.

Yugawara Hot Spring, Kanagawa Prefecture, Japan.

Khandivali Quarry, near Bombay, India.

Alaska; Iceland; Sardinia; British Columbia.

Name: From the original Japanese locality.