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Aquamarine variety of beryl with tourmaline on orthoclase. Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico. Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals. Austinite from the Ojuela Mine, Mapimí, Durango, Mexico. Ametrine containing amethyst and citrine, from Bolivia.
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. A crystal or crystalline solid is a solid ...
The garnet group has a general formula of X 3 Y 2 (SiO 4) 3, where X is a large eight-fold coordinated cation, and Y is a smaller six-fold coordinated cation. There are six ideal endmembers of garnet, split into two group. The pyralspite garnets have Al 3+ in the Y position: pyrope (Mg 3 Al 2 (SiO 4) 3), almandine (Fe 3 Al 2 (SiO 4) 3), and ...
Lanthanites are a group of isostructural rare earth element (REE) carbonate minerals. This group comprises the minerals lanthanite- (La), [ 3 ][ 4 ] lanthanite- (Ce), [ 5 ] and lanthanite- (Nd). [ 6 ] This mineral group has the general chemical formula of (REE) 2 (CO 3) 3 ·8 (H 2 O). Lanthanites include La, Ce, and Nd as major elements and ...
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Dolomite is a double carbonate, having an alternating structural arrangement of calcium and magnesium ions. Unless it is in fine powder form, it does not rapidly dissolve or effervesce (fizz) in cold dilute hydrochloric acid as calcite does. [9] Crystal twinning is common. Solid solution exists between dolomite, the iron -dominant ankerite and ...
MAPbBr 3 crystal. A perovskite is any material of formula ABX 3 with a crystal structure similar to that of the mineral perovskite, which consists of calcium titanium oxide (CaTiO 3). [2] The mineral was first discovered in the Ural mountains of Russia by Gustav Rose in 1839 and named after Russian mineralogist L. A. Perovski (1792–1856).
Soluble in H 3 PO 3 > 150 °C [1] Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Lanthanum aluminate is an inorganic compound with the formula LaAlO 3, often abbreviated as LAO. It is an optically transparent ceramic oxide with a distorted perovskite structure.