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
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Yugawaralite Information
| Data | Value |
| Name | Yugawaralite |
| Is a Variety of | Zeolite |
| Crystallography | Monoclinicz crystals tabular and very flat. |
| Colors | Colorless to white. |
| Luster | Vitreous. |
| Hardness | 4.5. |
| Density | 2.23-2.25. |
| Birefringence | 0.009. |
| Cleavage | Imperfect; very brittle. |
| Stone Sizes | Superb, 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. |
| Spectral | None. |
| Formula | CaAl2Si6O16 · 4H2O. |
| Pleochroism | None. |
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.
