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  2. Euhedral and anhedral - Wikipedia

    en.wikipedia.org/wiki/Euhedral_and_anhedral

    Euhedral pyrite crystals A subhedral sample showing sharp to anhedral pyrargyrite crystals. Euhedral and anhedral are terms used to describe opposite properties in the formation of crystals . Euhedral (also known as idiomorphic or automorphic ) crystals are those that are well-formed, with sharp, easily recognised faces .

  3. Pyrite - Wikipedia

    en.wikipedia.org/wiki/Pyrite

    Pyrite is used with flintstone and a form of tinder made of stringybark by the Kaurna people of South Australia, as a traditional method of starting fires. [17] Pyrite has been used since classical times to manufacture copperas (ferrous sulfate). Iron pyrite was heaped up and allowed to weather (an example of an early form of heap leaching ...

  4. Crystal habit - Wikipedia

    en.wikipedia.org/wiki/Crystal_habit

    Goethite replacing pyrite cubes. Factors influencing habit include: a combination of two or more crystal forms; trace impurities present during growth; crystal twinning and growth conditions (i.e., heat, pressure, space); and specific growth tendencies such as growth striations.

  5. Gemstone Meanings: Power and Significance of the 25 Most ...

    www.aol.com/gemstone-meanings-power-significance...

    AmethystAmethyst is a gemstone long associated with royalty and spiritualism and is said to bring tranquility and healing,” Salzer says. “In the same color spectrum wavelength as the third ...

  6. Pyrite group - Wikipedia

    en.wikipedia.org/wiki/Pyrite_group

    The pyrite group of minerals is a set of cubic crystal system minerals with diploidal structure. Each metallic element is bonded to six "dumbbell" pairs of non ...

  7. Heliotrope (mineral) - Wikipedia

    en.wikipedia.org/wiki/Heliotrope_(mineral)

    Setonite, also called African bloodstone, is composed of red jasper, grey chalcedony, and pyrite. Dragon's Blood, sometimes called Australian bloodstone, is composed of red jasper and green epidote. The name heliotrope derives from ancient beliefs about the manner in which the mineral reflects light.

  8. 25 Toys and Games That Will Trick Kids Into Learning at Home

    www.aol.com/25-toys-games-trick-kids-113820891.html

    It includes 15 gemstones like pyrite, amethyst, and quartz, plus digging tools and a full-color guide to tell them all about their finds. Photo credit: Amazon Melissa & Doug Construction Set in a Box

  9. Crystal - Wikipedia

    en.wikipedia.org/wiki/Crystal

    Crystals of amethyst quartz Microscopically, a single crystal has atoms in a near-perfect periodic arrangement; a polycrystal is composed of many microscopic crystals (called "crystallites" or "grains"); and an amorphous solid (such as glass) has no periodic arrangement even microscopically.

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