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2. Apache tears - Wikipedia

   en.wikipedia.org/wiki/Apache_tears

   Apache tears are rounded pebbles of obsidian or "obsidianites" composed of black or dark-colored natural volcanic glass, usually of rhyolitic composition and bearing conchoidal fracture. Also known by the lithologic term marekanite , this variety of obsidian occurs as subrounded to subangular bodies up to about 2 in (51 mm) in diameter, often ...

3. Crystal Healing: A Beginner’s Guide to Crystal Magic and ...

   www.aol.com/crystal-healing-beginner-guide...

   All crystals carry a healing, energetic vibration! Discover the wonders of healing crystals for your spiritual practice and wellness routine. Crystal Healing: A Beginner’s Guide to Crystal Magic ...

4. Obsidian - Wikipedia

   en.wikipedia.org/wiki/Obsidian

   Obsidian talus at Obsidian Dome, California Polished snowflake obsidian, formed through the inclusion of cristobalite crystals. The Natural History by the Roman writer Pliny the Elder includes a few sentences about a volcanic glass called obsidian (lapis obsidianus), discovered in Ethiopia by Obsidius, a Roman explorer.

5. Crystal healing - Wikipedia

   en.wikipedia.org/wiki/Crystal_healing

   Crystal healing is a pseudoscientific alternative-medicine practice that uses semiprecious stones and crystals such as quartz, agate, amethyst or opal. Despite the common use of the term "crystal", many popular stones used in crystal healing, such as obsidian, are not technically crystals .

6. Shungite - Wikipedia

   en.wikipedia.org/wiki/Shungite

   Shungite has been used since the middle of the 18th century as a pigment for paint, [10] and is currently sold under the names "carbon black" or "shungite natural black". [8] In the 1970s, shungite was exploited in the production of an insulating material, known as shungisite .

7. Volcanic glass - Wikipedia

   en.wikipedia.org/wiki/Volcanic_glass

   Like all types of glass, it is a state of matter intermediate between the closely packed, highly ordered array of a crystal and the highly disordered array of liquid. [1] Volcanic glass may refer to the interstitial material, or matrix , in an aphanitic (fine-grained) volcanic rock , or to any of several types of vitreous igneous rocks .