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  2. Iridescence - Wikipedia

    en.wikipedia.org/wiki/Iridescence

    Iridescence is caused by wave interference of light in microstructures or thin films. Examples of iridescence include soap bubbles, feathers, butterfly wings and seashell nacre, and minerals such as opal. Pearlescence is a related effect where some or most of the reflected light is white. The term pearlescent is used to describe certain paint ...

  3. Luminous gemstones - Wikipedia

    en.wikipedia.org/wiki/Luminous_gemstones

    The earliest known story about a grateful animal with a luminous gem is the Chinese Suihouzhu (隨侯珠, "the Marquis of Sui's pearl") legend that a year after he saved the life of a wounded snake, it returned and gave him a fabulous pearl that emitted a light as bright as that of the moon (Ball 1938: 504).

  4. Triboluminescence - Wikipedia

    en.wikipedia.org/wiki/Triboluminescence

    It is the emission of light from the fracture (rather than rubbing) of a crystal, but fracturing often occurs with rubbing. Depending upon the atomic and molecular composition of the crystal, when the crystal fractures, a charge separation can occur, making one side of the fractured crystal positively charged and the other side negatively charged.

  5. Obsidian - Wikipedia

    en.wikipedia.org/wiki/Obsidian

    It is an igneous rock. [6] Produced from felsic lava, obsidian is rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows. These flows have a high content of silica, giving them a high viscosity.

  6. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Rhyodacite – Volcanic rock rich in silica and low in alkali metal oxides – A felsic volcanic rock which is intermediate between a rhyolite and a dacite; Rhyolite – Igneous, volcanic rock, of felsic (silica-rich) composition Comendite – Hard, peralkaline igneous rock, a type of light blue grey rhyolite

  7. Strange light phenomenon seen before some earthquakes is a ...

    www.aol.com/news/strange-light-phenomenon-seen...

    Reports of “earthquake lights,” like the ones seen in videos captured before Friday’s 6.8-magnitude earthquake in Morocco, go back centuries to ancient Greece.

  8. Rare-earth element - Wikipedia

    en.wikipedia.org/wiki/Rare-earth_element

    The USGS study team has located a sizable area of rocks in the center of an extinct volcano containing light rare-earth elements including cerium and neodymium. It has mapped 1.3 million metric tons of desirable rock, or about ten years of supply at current demand levels. The Pentagon has estimated its value at about $7.4 billion. [185]

  9. Lapis lazuli - Wikipedia

    en.wikipedia.org/wiki/Lapis_Lazuli

    Lapis lazuli (UK: / ˌ l æ p ɪ s ˈ l æ z (j) ʊ l i, ˈ l æ ʒ ʊ-,-ˌ l i /; US: / ˈ l æ z (j) ə l i, ˈ l æ ʒ ə-,-ˌ l i /), or lapis for short, is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.

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