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Types of opal photo: Amazing Geologist page on facebook Opal is a hydrated amorphous form of silica (SiO2·nH2O), Because of its amorph...

from About.com Style

6 Types of Awe-inspiring Opal

What are the different kinds of opal? Learn about each type of opal and how to identify them.

Honduran Opal from the Tablon mine is best known for its production of black matrix opal. The Tablon mine is located outside of the town of Erandique. Honduras. The color bands are within the vesicular black basalt  and the opal is congealed within the rock itself. Compared to many types of opals It cuts very stable stones as far as crazing or cracking.

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Tiaras purported to have belonged to Sophia Petrovna Durnovo. the tiara on top is of turquoise and diamonds, Russian type, reminiscent of the kokoshnik form. The second tiara of diamonds with very large charming opals, is typical of the times, "Restoration", and the third consisting of diamond flowers and leaves.

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from About.com Style

6 Types of Awe-inspiring Opal