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2. Fire agate - Wikipedia

   en.wikipedia.org/wiki/Fire_agate

   The fire agates were formed during this period of volcanism when hot water, saturated with silica and iron oxide, repeatedly filled cracks and bubbles in the surrounding rock. Fire agates have beautiful iridescent rainbow colors, similar to opal , with a measurement of hardness on the Mohs scale of between 5 and 7 which reduces the occurrence ...

3. Chalcedony - Wikipedia

   en.wikipedia.org/wiki/Chalcedony

   Agate. Agate is a fibrous, banded variety of chalcedony that occurs in a variety of colors and patterns. [9] Iris agate shows exceptional iridescence when light (especially pinpointed light) is shone through the stone. Landscape agate is chalcedony with a number of different mineral impurities making the stone resemble landscapes. [10]

4. Opal - Wikipedia

   en.wikipedia.org/wiki/Opal

   The brightness of the fire in opal ranges on a scale of 1 to 5 (with 5 being the brightest) [14] "Girasol opal" is a term sometimes mistakenly and improperly used to refer to fire opals, as well as a type of transparent to semitransparent type milky quartz from Madagascar which displays an asterism, or star effect when cut properly.

5. Opals Are One of the Trendiest Stones Right Now—But ... - AOL

   www.aol.com/opals-one-trendiest-stones-now...

   Multicolored Jelly Opal and Fire Opal Gold Triple Drop Earrings. $2750.00 at 1stdibs.com. Black Opal and Diamond Cocktail Ring. $159490.00 at 1stdibs.com.

6. Agate - Wikipedia

   en.wikipedia.org/wiki/Agate

   Agate will form crystals within the reduced cavity, and the apex of each crystal may point towards the center of the cavity. The priming layer is often dark green, but can be modified by iron oxide resulting in a rust like appearance. [7] Agate is very durable and is often found detached from its host matrix, which may have eroded more quickly.

7. Opalescence - Wikipedia

   en.wikipedia.org/wiki/Opalescence

   Each of the three notable types of opal – precious, common, and fire [3] – display different optical effects; therefore, the intended meaning varies depending on context. The general definition of opalescence is a milky iridescence displayed by an opal, which describes the visual effect of precious opal very well, and opalescence is ...