18 Various Kinds of Opals
When most people think of an opal, they might think of a milky-colored stone containing a rainbow of stripes or flecks inside it. What many people don’t know is that they are incredibly diverse in appearance, and are not actually minerals. Opals are a solid, amorphous form of silica, and are classified as “mineraloids”. Like other mineraloids, such as amber, pearl, and obsidian, they lack structural order, or “crystallinity”.
From the top:
- Black Opals
- Cat’s Eye Opals
- Dendritic Opals
- Flamingo Opals
- Peruvian Pink Opals
- Zebra Opals
- Leopard Opals
- Yowah Nut and Koroit Opals (both have the same characteristics - they merely come from two different areas).
- Brown Opals
- Ethiopian Honeycomb Opals
- Green Opals (Serbian, Tanzanian, and Brazilian)
- Peruvian Blue Opals
- Matrix Opals
- Landscape Opals (Andean and Australian)
- Mexican Fire Opals
- Crystal Opals
- Australian Boulder Opals
- Ethiopian Ribbon Opals
(Side note - the image backgrounds are transparent, except for the matrix/landscape picture, which seems hellbent on being an asshat, no matter how many times I try to fix it)
The Mineral Moon (NASA/JPL)
"This mosaic of 53 images was recorded by the Jupiter-bound Galileo spacecraft as it passed near our own large natural satellite in 1992. The pictures were recorded through three spectral filters and combined in an exaggerated false-color scheme to explore the composition of the lunar surface as changes in mineral content produce subtle color differences in reflected light."
Ammonite, opalised, 254nm fluorescence, photograph by The Bob - Bob Fosbury
Udomsak Krisanamis (Thai, b. 1966), Bullet Proof Soul, 2001. Acrylic and collage on silk, 12 x 12 in.
Van Gogh, View of Paris, Summer 1886. Oil on canvas, 54.0 x 72.5 cm. Van Gogh Museum, Amsterdam.
Summer house, Serbia by Katarina Stefanović
House in the middle of Drina River near the town of Bajina Basta, Serbia.