Coesite is a high-pressure polymorph (crystal form) of silica, silicon dioxide (SiO2). It is a form (polymorph) of silicon dioxide SiO2 that is formed when very high pressure (2–3 gigapascals), and moderately high temperature (700°C, 1,300°F), are applied to quartz. Coesite was first synthesi.....
Lechatelierite is a natural silica glass that has the same chemical composition as coesite, cristobalite, stishovite, quartz, and tridymite but has a different crystal structure. It is silica glass, amorphous SiO2, non-crystalline mineraloid. It is an amorphous form of silicon dioxide (SiO2), lac.....
Nadorite is a mineral with the chemical formula PbSbO2Cl. It is a mineral consisting of a brownish yellow lead chloride and stibnite. It is a mineral containing antimony, lead, oxygen, and chlorin, occurring in brownish orthorhombic crystals at Djebel-Nador in Algeria. The Nadorite crystals are a.....
Seifertite is an orthorhombic mineral containing oxygen and silicon. It is a silicate mineral with the formula SiO2 and is one of the densest polymorphs of silica. It is a dense orthorhombic polymorph of silica from the Martian meteorites Shergotty and Zagami. However, the stable crystal struct.....
Zinc carbonate (ZnCO3), a mineral that was the main source of zinc until the 1880s, when it was substituted by sphalerite, is Smithsonite, also known as turkey fat or zinc spar. It is a secondary mineral mainly formed in the presence of CO2 by the weathering and alteration of sphalerite. The oxid.....
Nacrite is a clay mineral, consisting of hydrous silicate of aluminum and being polymorphous with kaolinite. Its formula, Al2Si2O5(OH)4, is a clay mineral that is polymorphous (or polytypic) with kaolinite. It is the rarest of the kaolin polymorphs known. It is basic aluminum silicate clay that i.....
Deposited sediments can harden into rock over time; next, it compacts the sediments. That is, by the weight of sediments on top of them, they are pressed together. Next, together, the sediments are cemented. In the gaps between the loose sediment particles, minerals fill up. From the water that p.....
Nabesite is a rare silicate mineral of the zeolite group with the chemical formula Na2BeSi4O10·4(H2O). It is an orthorhombic-disphenoidal mineral containing beryllium, hydrogen, oxygen, silicon, and sodium. It occurs as colorless to white orthorhombic crystals in thin platy mica like sheets. It .....
Rose quartz is a type of quartz that exhibits a pale pink to rose red hue. A pink variety of quartz, that ranges from very pale pink to deep reddish-pink, and from opaque to transparent. The color is usually considered due to trace amounts of titanium, iron, or manganese, in the material. It is b.....
Nabalamprophyllite has a general formula of Ba(Na,Ba){Na3Ti[Ti2O2Si4O14](OH,F)2}. It is a monoclinic-prismatic mineral containing aluminum, barium, calcium, fluorine, hydrogen, iron, magnesium, manganese, oxygen, potassium, silicon, sodium, strontium, and titanium. The name is given for its compo.....
Morganite is the pink to orange-pink variety of beryl, a mineral that includes emerald and aquamarine. It is also known as “pink beryl”, “rose beryl”, “pink emerald” and “cesian (or caesian) beryl”, is a rare light pink to a rose-colored gem-quality.....
Menilite is an impure opal in brown or dull grayish concretions. It is sometimes considered a variety of opal but probably impure and really just young Flint nodules that haven’t recrystallized to quartz yet; thus really a rock rather than a mineral. The mineral make-up of these stones is calci.....