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Minerals

6323 results

Mineral

Rogermitchellite

rogermitchellite

Formula
Na6Sr12Ba2Zr13Si39B4O123(OH)6·20H2O
White tufts and acicular crystals of the beryllium silicate mineral roggianite from the type (Alpe Rosso, Vigezzo Valley, Piedmont, Italy) and only one of the two localities known worldwide. Mineral

Roggianite

roggianite

Formula
Ca2Be(OH)2Al2Si4O13 * 2.5H2O
Mineral

Rohaite

rohaite

Formula
(Tl,Pb,K)2Cu8.7Sb2S4
Yellow brown partially melted crystal of the very rare Fe chloride mineral rokühnite from the type locality in Hildesheim, Germany (Hildesheim, Lower Saxony, Germany). Analyzed specimen by SEM/EDS. The mineral species is very higroscopic, from Mindat: water-soluble; topotactical hydration and rapid oxidation in air. okuhnite is described as light green, but rapidly oxidizes and turns brown when exposed to air and moisture. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Rokühnite

rokühnite
Mineral

Rollandite

rollandite

Formula
Cu3(AsO4)2 * 4H2O
Mineral

Romanorlovite

romanorlovite

Formula
K8Cu6Cl17(OH)3
Romanechite from the Marquette County, Michigan, USA. Picture taken at the "National Museum of Natural History, Washington D.C, USA. Mineral

Romanèchite

romanèchite

Formula
(Ba,H2O)2(Mn⁴⁺,Mn³⁺)5O10
Mineral

Romarchite

romarchite

Formula
SnO
Mineral

Rondorfite

rondorfite

Formula
Ca8Mg(SiO4)4Cl2
Colourless bladed crystals of rongibbsite. Field of view 4 mm. From: Unnamed prospect, Maricopa Co., Arizona, USA. Mineral

Rongibbsite

rongibbsite

Formula
Pb2(Si4Al)O11(OH)
Red brown crystals of Ronneburgite with yellow white Picromerite (Picture size: 2 mm) Locality: Open pit Lichtenberg, Ronneburg, Thuringia, Germany Mineral

Ronneburgite

ronneburgite

Formula
K2MnV4O12
Mohs
3
Mineral

Ronpetersonite

ronpetersonite

Formula
BaWO4
White rooseveltite associated to bismoclite and to yellow microcrystals of the very rare mineral zaïrite, from one of the very few known localities worldwide (Tazna, Cerro Tazna, Atocha-Quechisla, Nor Chichas Province, Potosi Department, Bolivia). Ex. Erich Laskowski collection (USA). Mineral

Rooseveltite

rooseveltite

Formula
BiAsO4
Roquesite (grey, CuInS2), as an inclusion in Bornite Locality: Charrier, Département Allier, France Exposed in the Mineralogical Museum of University Bonn, Germany Mineral

Roquesite

roquesite

Formula
CuInS2
Mineral

Rorisite

rorisite

Formula
CaFCl
Bright-blue velvety rosasite mass lining a cavity, from 79 mine, Winkelman, Arizona, USA. Photograph taken at the Natural History Museum, London. Mineral

Rosasite

rosasite

Formula
CuZnCO3(OH)2
Mohs
4.5
Roscherite - Galiléia, Doce valley, Minas Gerais, Southeast Region, Brazil - XX1mm Mineral

Roscherite

roscherite

Formula
Ca2Mn²⁺5Be4(PO4)6(OH)4 * 6H2O
Gold and roscoelite from California, USA. (public display, Leadville Mining Museum, Leadville, Colorado, USA) A mineral is a naturally-occurring, solid, inorganic, crystalline substrance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 4900 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates. Elements are fundamental substances of matter - matter that is composed of the same types of atoms. At present, 118 elements are known (four of them are still unnamed). Of these, 98 occur naturally on Earth (hydrogen to californium). Most of these occur in rocks & minerals, although some occur in very small, trace amounts. Only some elements occur in their native elemental state as minerals. To find a native element in nature, it must be relatively non-reactive and there must be some concentration process. Metallic, semimetallic (metalloid), and nonmetallic elements are known in their native state as minerals. Gold (Au) is the most prestigious metal known, but it's not the most valuable. Gold is the only metal that has a deep, rich, metallic yellow color. Almost all other metals are silvery-colored. Gold is very rare in crustal rocks - it averages about 5 ppb (parts per billion). Where gold has been concentrated, it occurs as wires, dendritic crystals, twisted sheets, octahedral crystals, and variably-shaped nuggets. It most commonly occurs in hydrothermal quartz veins, disseminated in some contact- & hydrothermal-metamorphic rocks, and in placer deposits. Placers are concentrations of heavy minerals in stream gravels or in cracks on bedrock-floored streams. Gold has a high specific gravity (about 19), so it easily accumulates in placer deposits. Its high density allows prospectors to readily collect placer gold by panning. In addition to its high density, gold has a high melting point (over 1000º C). Gold is also relatively soft - about 2.5 to 3 on the Mohs Hardness Scale. The use of pure gold or high-purity gold in jewelry is not desirable as it easily gets scratched. The addition of other metals to gold to increase the hardness also alters the unique color of gold. Gold jewelry made & sold in America doesn’t have the gorgeous rich color of high-purity gold. Locality: Stuckslacker Mine, Coloma, California, USA Mineral

Roscoelite

roscoelite

Formula
K(V³⁺,Al)2(AlSi3O10)(OH)2
Mohs
2.5
(United States Polar Rock Repository collection, Byrd Polar Research Center, Ohio State University, Columbus, Ohio, USA) A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 5500 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates. The silicates are the most abundant and chemically complex group of minerals. All silicates have silica as the basis for their chemistry. "Silica" refers to SiO2 chemistry. The fundamental molecular unit of silica is one small silicon atom surrounded by four large oxygen atoms in the shape of a triangular pyramid - this is the silica tetrahedron - SiO4. Each oxygen atom is shared by two silicon atoms, so only half of the four oxygens "belong" to each silicon. The resulting formula for silica is thus SiO2, not SiO4. The simplest & most abundant silicate mineral in the Earth's crust is quartz (SiO2). All other silicates have silica + impurities. Many silicates have a significant percentage of aluminum (the aluminosilicates). Quartz (silicon dioxide/silica - SiO2) is the most common mineral in the Earth's crust. It is composed of the two most abundant elements in the crust - oxygen and silicon. It has a glassy, nonmetallic luster, is commonly clearish to whitish to grayish in color, has a white streak, is quite hard (H≡7), forms hexagonal crystals, has no cleavage, and has conchoidal fracture. Quartz can be any color: clear, white, gray, black, brown, pink, red, purple, blue, green, orange, etc. The pink coloration of rose quartz has been attributed to the presence of Ti+4 impurity or the presence of dumortierite-like fibers. Some rose quartz coloration has been attributed to radiation bombardment of quartz having Al and P impurities. Locality: small pegmatite body near the Reedy Glacier, Wisconsin Range, Transantarctic Mountains, Antarctica Photo gallery of quartz and rose quartz: www.mindat.org/gallery.php?min=3337 and www.mindat.org/gallery.php?min=3456 Mineral

Rose Quartz

Formula
SiO2
Mohs
7
Colour
Pink
Roselite Locality: Bou Azzer, Bou Azzer District, Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco (Locality at mindat.org) Picture width 2 mm. Collection and photograph Christian Rewitzer Mineral

Roselite

roselite

Formula
Ca2Co(AsO4)2·2H2O
Mohs
3.5
Colour
pink
Yellowish crystal aggregates of the rare phosphate rosemaryite from one of the few localities known worldwide: Gatumba Pegmatite, Ngororero, Western Province, Rwanda . Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Rosemaryite

rosemaryite

Formula
(Na,Ca,Mn)(Mn,Fe²⁺)(Fe³⁺,Mg)Al(PO4)3
Colorless radial crystals of the very rare rosenbergite, a mineral of simple but curious chemistry since it is an aluminuim fluoride, AlF3·3H2O. Only 4 localities known worldwide, being this one the type locality: Le Cetine Mine, Siena, Tuscany, Italy. Mineral

Rosenbergite

rosenbergite

Formula
AlF3.3H2O
Rosenbuschite - Biotite - Kali feldspar from Barkevigschören, Langesundfjord, Norway Mineral

Rosenbuschite

rosenbuschite

Formula
Ca6Zr2Na6ZrTi(Si2O7)4(OF)2F4
Rosenhahnite Locality: Rosenhahnite occurrence, Russian River, Cloverdale [Sonoma County], Mendocino County, California, USA (Locality at mindat.org) Field of view 4 mm. Depth of field is achieved with CombineZM. Specimen and photo Leon Hupperichs. Mineral

Rosenhahnite

rosenhahnite

Formula
HCa3[Si3O9(OH)]