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Asterism is generated by reflections of light from twin-lamellae or from extremely fine needle-shaped acicular inclusions within the stone's crystal structure. [1] A common cause is oriented sub-microscopic crystals of rutile within the gem mineral. It occurs in rubies, sapphires, garnet, diopside, and spinel when a cabochon is cut from a ...
Crystal skulls are human skull hardstone carvings made of clear or milky quartz rock, known in art history as "rock crystal". They are often claimed to be pre-Columbian Mesoamerican artifacts by their alleged finders; however, none of the specimens made available for scientific study have been authenticated as pre-Columbian in origin. [1]
It must have a well-defined crystallographic structure; or, more generally, an ordered atomic arrangement. [15] This property implies several macroscopic physical properties, such as crystal form, hardness, and cleavage. [16] It excludes ozokerite, limonite, obsidian and many other amorphous (non-crystalline) materials that occur in geologic ...
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Pages in category "Crystals" The following 97 pages are in this category, out of 97 total. This list may not reflect recent changes. ...
The Clone Wars: . The Headpiece to the Staff of Ra (the headpiece on Senator Kharrus' staff) and the Ark of the Covenant appear in the first-season episodes "The Gungan General" and "Liberty on Ryloth" respectively, while the Season Three finale "Wookiee Hunt" includes the Crystal Skull of Akator from Indiana Jones and the Kingdom of the Crystal Skull in the Trandoshan trophy room.
⭐️ Must read: 6 ways to get the lowest rate on your next mortgage. Purchase rates for Friday, December 20, 2024. 30-year fixed rate. 6.89%. 20-year fixed rate. 6.66%. 15-year fixed rate.
The Cougars' undefeated season ended on Saturday night. BYU tumbled seven spots after its late-night loss to Kansas in Week 12. The Cougars are now at No. 14 in the AP Top 25 after the Jayhawks ...