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Crystals are deep red in color and usually very well-formed. Wulfenite was approved as the official state mineral of Arizona in 2017. [5] The Los Lamentos locality in Mexico produced very thick tabular orange crystals. Another locality is Mount Peca in Slovenia. The crystals are yellow, often with well-developed pyramids and bipyramids.
Morganite is an orange or pink variety of beryl and is also a gemstone. [2] Morganite is mined in Brazil, Afghanistan, Mozambique, Namibia, the United States, and Madagascar. [3] Morganite has grown in popularity since 2010. [2] Brides and CNN have listed it as a possible alternative to diamond for engagement rings. [4] [5]
The color is usually colorless or white, also yellow, brown, pink, salmon, orange, red, green, blue or black. The luster is generally vitreous, and on the perfect cleavage parallel to the plane of symmetry it is markedly pearly. The streak is white and crystals are transparent to translucent.
Bahia Emerald [2]; Carolina Emperor, [3] [4] 310 carats uncut, 64.8 carats cut; discovered in the United States in 2009, resides in the North Carolina Museum of Natural Sciences, Raleigh, NC, US
Lead(II,IV) oxide, also called red lead or minium, is the inorganic compound with the formula Pb 3 O 4.A bright red or orange solid, it is used as pigment, in the manufacture of batteries, and rustproof primer paints.
The mixture is stirred at 100 °C, and then subjected to evaporation, cooling, crystallization, and drying to obtain the orange crystals of sodium tetrachloroaurate. [4] [6] H[AuCl 4] + NaCl → Na[AuCl 4] + HCl 2 H[AuCl 4] + Na 2 CO 3 → 2 Na[AuCl 4] + H 2 O + CO 2. However, more efficient preparation methods have been discovered recently.
Vermilion is not one specific hue; mercuric sulfides make a range of warm hues, from bright orange-red to a duller reddish-purple that resembles fresh liver. Differences in hue are caused by the size of the ground particles of pigment. Larger crystals produce duller and less orange hues.
The streak is orange-yellow; Mohs hardness is 2.5–3; and the specific gravity is 6.0. Crocoite crystal structure It was discovered at the Berezovskoe Au Deposit (Berezovsk Mines) near Ekaterinburg in the Urals in 1766; [ 6 ] and named crocoise by F. S. Beudant in 1832, from the Greek κρόκος ( krokos ), [ 7 ] saffron, in allusion to its ...