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Selenite, satin spar, desert rose, and gypsum flower are crystal habit varieties of the mineral gypsum.. All varieties of gypsum, including selenite and alabaster, are composed of calcium sulfate dihydrate (meaning that it has two molecules of water), with the chemical formula CaSO 4 ·2H 2 O. Selenite contains no selenium, the similar names both derive from Greek selḗnē (σελήνη 'Moon').
Iceland spar holds historical importance in optics and the study of light. [18] One of its most notable properties is its ability to exhibit double refraction. [18] This phenomenon was first described by the Danish scientist Erasmus Bartholin in 1669, who observed it in a specimen of Iceland spar.
Celadonite is a mica group mineral, a phyllosilicate of potassium, iron in both oxidation states, aluminium and hydroxide with formula K(Mg,Fe 2+)(Fe 3+,Al)[Si 4 O 10](OH) 2.. It crystallizes in the monoclinic system and usually forms massive aggregates of prismatic crystallites or, more commonly, in dull clay masses.
Pages in category "Metaphysical properties" The following 65 pages are in this category, out of 65 total. This list may not reflect recent changes. *
Ulexite (/ juː ˈ l ɛ k s aɪ t /) sometimes called TV rock or TV stone due to its unusual optical properties, is a hydrous borate hydroxide of sodium and calcium with the chemical formula NaCaB 5 O 6 (OH) 6 ·5H 2 O.
The latter property is particularly common in gem-quality corundum. [80] [81] The streak of a mineral refers to the colour of a mineral in powdered form, which may or may not be identical to its body colour. [79] The most common way of testing this property is done with a streak plate, which is made out of porcelain and coloured either white or ...
Trona (trisodium hydrogendicarbonate dihydrate, also sodium sesquicarbonate dihydrate, Na 2 CO 3 ·NaHCO 3 ·2H 2 O) is a non-marine evaporite mineral. [4] [6] It is mined as the primary source of sodium carbonate in the United States, where it has replaced the Solvay process used in most of the rest of the world for sodium carbonate production.
aquamarine varieties), charoite, tourmaline, labradorite, selenite, feldspar, apatite, moonstone, thomsonite and scapolite amongst others. Chatoyancy is not limited to gemstones but can also be found in various wood species and carbon fiber. Synthetically made gemstones with optical fibers can also have chatoyancy. These gemstones are available ...
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