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Povondraite

Povondraite is a rare silicate mineral from the tourmaline group with formula: NaFe 3+ 3 Si 6 O 18 3 O. It is a dark brown to black nearly opaque mineral with a resinous to splendent luster. It crystallizes in the trigonal crystal system as equan ...

                                               

Pyrargyrite

Pyrargyrite is a sulfosalt mineral consisting of silver sulfantimonide, Ag 3 SbS 3. Known also as dark red silver ore or ruby silver, it is an important source of the metal. It is closely allied to, and isomorphous with, the corresponding sulfars ...

                                               

Segnitite

Segnitite, named after Australian mineralogist, gemologist and petrologist Edgar Ralph Segnit, is a lead iron arsenate mineral. The mineral was named after E. R. Segnit due to his contributions to Australian mineralogy. Segnitite was first found ...

                                               

Stillwaterite

The palladium arsenide mineral Stillwaterite has a general formula of Pd 8 As 3. Stillwaterite was first discovered in the Banded and Upper zones of the Stillwater igneous complex in Montana, United States, and has been reported in the Lac-des-Il ...

                                               

Zirsilite-(Ce)

Zirsilite- is a very rare mineral of the eudialyte group, with formula 12 3 Ca 6 Mn 3 Zr 3 NbSi 2 O 3 H 2 O. The original formula was extended to show the presence of cyclic silicate groups and the presence of silicon at the M4 site, according to ...

                                               

Zussmanite

Zussmanite 13 14) is a hydrated iron-rich silicate mineral. Zussmanite occurs as pale green crystals with perfect cleavage.

                                               

Trapiche emerald

Trapiche emerald is a rare variety of the gemstone emerald, characterized by a six-pointed radial pattern of ray-like spokes of dark impurities. It is one of several types of trapiche or trapiche-like minerals, which also include trapiche ruby, s ...

                                               

Golden sheen sapphire

Golden Sheen Sapphire, is a name that is known to be associated with golden sapphire. It typically shows a metallic golden colour with translucent material also possible. It has the same color, chemical properties and features as black star sapph ...

                                               

Demantoid

Demantoid is the green gemstone variety of the mineral andradite, a member of the garnet group of minerals. Andradite is a calcium- and iron-rich garnet. The chemical formula is Ca 3 Fe 2 3 with chromium substitution as the cause of the demantoid ...

                                               

Grossular

Grossular is a calcium-aluminium species of the garnet group of minerals. It has the chemical formula of Ca 3 Al 2 3 but the calcium may, in part, be replaced by ferrous iron and the aluminium by ferric iron. The name grossular is derived from th ...

                                               

Tsavorite

Tsavorite or tsavolite is a variety of the garnet group species grossular, a calcium-aluminium garnet with the formula Ca 3 Al 2 Si 3 O 12. Trace amounts of vanadium or chromium provide the green color. In 1967, British gem prospector and geologi ...

                                               

Hiddenite Gem Mines

Hiddenite, North Carolina, United States, is a centre for the mining of gemstones. Three larger mines found there are Adams Mine, NAEM and the Emerald Hollow Mine. They are collectively known as the Hiddenite Gem Mines.

                                               

Precious coral

Precious coral, or red coral, the common name given to a genus of marine corals, Corallium. The distinguishing characteristic of precious corals is their durable and intensely colored red or pink-orange skeleton, which is used for making jewelry.

                                               

Ametrine

Ametrine, also known as trystine or by its trade name as bolivianite, is a naturally occurring variety of quartz. It is a mixture of amethyst and citrine with zones of purple and yellow or orange. Almost all commercially available ametrine is min ...

                                               

Cape May diamonds

Cape May diamonds are quartz pebbles found on the beaches of Cape May Point, New Jersey. The pebbles are sometimes collected, cut and polished to resemble diamonds, then sold locally as souvenirs. Cape May diamonds are usually collected by beach ...

                                               

Ceylonite

Ceylonite and pleonaste are dingy blue or grey to black varieties of spinel. Ceylonite, named for the island of Ceylon, is a ferroan spinel with Mg:Fe from 3:1 and 1:1, and little or no ferric iron. Pleonaste is named from the Greek for abundant, ...

                                               

Magnesiocummingtonite

Magnesiocummingtonite is the magnesium rich endmember of the cummingtonite-grunerite series of the amphibole group of minerals, with the following composition: 7 Si 8 O 22 2. Magnesiocummingtonite is considered to be an aptly named magnesium rich ...

                                               

Humite (mineral group)

The humite group is a group of nesosilicates with the general formula A n m 2. When A is predominantly magnesium we have the humite subgroup: norbergite, Mg 3 SiO 4F,OH 2 chondrodite, Mg,Fe,Ti 5 SiO 4 2 F,OH,O 2 clinohumite, Mg,Fe 9 SiO 4 F,OH 2 ...

                                               

Mariposite

Mariposite is a mineral which is a chromium-rich variety of mica, which imparts an attractive green color to the generally white dolomitic marble in which it is commonly found. It was named for Mariposa, California, though it can be found in seve ...

                                               

Pyroxene

The pyroxenes are a group of important rock-forming inosilicate minerals found in many igneous and metamorphic rocks. Pyroxenes have the general formula XY 2 O 6, where X represents calcium, sodium, iron or magnesium and more rarely zinc, mangane ...

                                               

Coal Creek Serpentinite (Texas geology)

The Coal Creek Serpentinite is a small section of outcrop that consists of precambrian aged metamorphic rock located in the Llano Uplift area of Texas. The entire outcrop can be accessed by driving on Willow City Loop and County Road 310. The eas ...

                                               

Spinel group

The spinels are any of a class of minerals of general formulation AB 2 X 4 which crystallise in the cubic crystal system, with the X anions arranged in a cubic close-packed lattice and the cations A and B occupying some or all of the octahedral a ...

                                               

Hypothetical zeolite

Hypothetical zeolites are combinatorial models of potential structures of the minerals known as zeolites. They are four-regular periodic graphs, with vertices representing the tetrahedral atom and the edges representing the bridging oxygen atoms. ...

                                               

SSZ-13

SSZ-13 is an aluminosilicate zeolite mineral possessing 0.38 × 0.38 nm micropores. It belongs to the ABC-6 family of zeolites as well as offretite, cancrinite, erionite and other related minerals. The framework topology is the same as that of cha ...

                                               

Zeolite X

                                               

Zeolite Y

                                               

ZSM-5

ZSM-5, Zeolite Socony Mobil–5), is an aluminosilicate zeolite belonging to the pentasil family of zeolites. Its chemical formula is Na n Al n Si 96–n O 192 16H 2 O (0

                                               

Alunite

                                               

Antimonate minerals

                                               

Calciovolborthite

                                               

Copper(I) minerals

                                               

Copper(II) minerals

                                               

Rare-earth mineral

A rare-earth mineral contains one or more rare-earth elements as major metal constituents. Rare-earth minerals are usually found in association with alkaline to peralkaline igneous complexes, in pegmatites associated with alkaline magmas and in o ...

                                               

Sayrite

Sayrite 5 O 6 2 4) is an alteration product of uraninite named after the X-ray crystallographer David Sayre. Sayrite contains hydrogen, oxygen, uranium, and lead. It is mined at Shinkolobwe Mine, Kambove District, Haut-Katanga, Democratic Republi ...

                                               

Manganese(II,III) minerals

                                               

Manganese(II,IV) minerals

                                               

Manganese(II) minerals

                                               

Manganese(III,IV) minerals

                                               

Manganese(III) minerals

                                               

Manganese(IV) minerals

                                               

Mercury(I) minerals

                                               

Mercury(II) minerals

                                               

Molybdate minerals

                                               

Krutovite

Krutovite is a cubic nickel diarsenide with a chemical composition of NiAs 2 and a sulfur content of 0.02-0.34 weight percent. Krutovite is composed of nickel and arsenic with trace to minor amounts of cobalt, iron, copper, sulfur, and antimony.

                                               

Eudialyte group

Eudialyte group is a group of complex trigonal zircono- and, more rarely, titanosilicate minerals with general formula 18− ring silicate groups. Space group is usually R 3 m or R -3 m but may be reduced to R 3 due to cation ordering. Like other z ...

                                               

Tungstate minerals

                                               

Calamine (mineral)

Calamine is a historic name for an ore of zinc. The name calamine was derived from lapis calaminaris, a Latin corruption of Greek cadmia, the old name for zinc ores in general. The name of the Belgian town of Kelmis, La Calamine in French, which ...

                                               

Giant sequoias near Kolpin

The two giant sequoias near Kolpin in the parish of Demen in the district of Ludwigslust-Parchim in the German state of Mecklenburg-Vorpommern, are a natural monument. They belong to the species commonly known as giant sequoia, but also Wellingto ...

                                               

Bergstein (Hohe Loog)

The Bergstein is a natural monument in the borough of Neustadt an der WeinstraSe in the German state of Rhineland-Palatinate. It is designated as ND-7316-202.

                                               

Bergstein (Weinbiet)

The Bergstein is a natural monument in the borough of Neustadt an der WeinstraSe in the German state of Rhineland-Palatinate. It has the number ND-7316-173. The Bergstein is described as a rock group and lies at an elevation of ca. 354 m 1.161 ft ...

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