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Minerals

6323 results

Mineral

Rhabdophane-(Nd)

rhabdophane-(Nd)

Formula
NdPO4·H2O
Mineral

Rhabdophane-(Y)

rhabdophane-(Y)

Formula
Y(PO4)·H2O
Rheniite Locality: Kudriavy (Kudryavyi) volcano, Iturup Island, Kuril Islands, Sakhalinskaya Oblast', Far-Eastern Region, Russia (Locality at mindat.org) Rheniite is the only known mineral with Rhenium as its primary metallic constituent and as such is a fascinating species. It occurs at a volcanic vent in this remote area of Russia, and scientists have to climb down into hot crevasses to find the stuff. That being said, it is usually pretty ugly and massive material in terms of specimen appeal on the macro level. THIS piece, brought to my attention by my friend Dmitriy Belakovskiy of the Fersman Museum, has rheniite draped liberally on one side of the specimen and actual hardened rock made from the bubbly lava on the other! This shows the origins of the material so well, compared to most rather chunky specimens. Even aside from the lava, it is a really rich specimen with LOTS of bright microcrystalline rheniite. 8.9 x 7.8 x 7.7 cm Mineral

Rheniite

rheniite

Formula
ReS2
A grain formed by black metallic microcrystals of the extremely rare native element rhenium in an analyzed specimen by SEM/EDS. Analysis shows a purity of 86-91% Re, being the remaning W, Fe and Mn. These grains were found in wolframite concentrates from this Russian locality (Zabaykalsky Krai,, Russian Federation). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Rhenium (Native)

rhenium (native)

Formula
Re
Mineral

Rhodarsenide

rhodarsenide

Formula
Rh2As
Silky white acicular crystals of the rare mineral rhodesite on a contrasting matrix. From Trinite Claim, Wildcat Peak, Trinity County, California, United States of America. Mineral

Rhodesite

rhodesite

Formula
KHCa2Si8O19·5H2O
Mineral

Rhodium (Native)

rhodium (native)

Formula
(Rh, Pt)
Mohs
3.5
Rhodizite Locality: Sahatany Pegmatite Field (Mt Bity (Ibity) area), Manandona Valley, Vakinankaratra Region, Antananarivo Province, Madagascar (Locality at mindat.org) Fine rhodizite specimens with rich color, excellent lustre, and sharpness of the crystal (which is just over 1 cm in size). 4.4 x 3.2 x 1.5 cm. Mineral

Rhodizite

rhodizite

Formula
KBe4Al4(B11Be)O28
rhodochrosite, chalcopyrite, quartz : Huayllapon Mine (Huallapon Mine), Pasto Bueno District, Pallasca Province, Ancash Department, Perù Mineral

Rhodochrosite

rhodochrosite

Formula
MnCO3
crystals of rhodonite, crystals of calcite, crystals of quartz : San Martín Mine, Chiurucu (Chiuruco), Huallanca, Bolognesi Province, Ancash Department, Perù Mineral

Rhodonite

rhodonite

Formula
CaMn3Mn(Si5O15)
Rhodostannite, Andorite Locality: San José Mine, Oruro City, Cercado Province, Oruro, Bolivia Original description: These tiny, 0.5mm rhodostannite crystals on andorite were analysed by SEM and seem to have the right components and form for rhodostannite. Field of view is about 20mm. Private collection. Mineral

Rhodostannite

rhodostannite

Formula
Cu2FeSn3S8
Microscopic inclusions (not visible under the binocular microscope) of the extremely rare rhodium mineral rhodplumsite in a polished section that was probably analyzed by the former owner of the specimen, the Vandenbroucke Museum, but the analysis is no longer available. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Rhodplumsite

rhodplumsite

Formula
Rh3Pb2S2
Mineral

Rhomboclase

rhomboclase

Formula
(H5O2)Fe³⁺(SO4)2 * 2H2O
Rhönite (Largest Crystal Size: 0.16 mm) Locality: Nickenicher Sattel (Eicher Sattel), Nickenich, Andernach, Eifel, Rhineland-Palatinate, Germany There are lots of other crystals on the specimen, some of which can be seen in the upper left corner, but they are either not as well formed or not as well exposed. Mineral

Rhönite

rhönite
:An ugglity for most people, but a jewel for a speciescollector. Collection and photo Erik Vercammen Locality: Yuzhno-Faizulinskoe Mn deposit, Sibay, Bashkortostan Republic, Southern Urals, Urals Region, Russia Mineral

Ribbeite

ribbeite

Formula
Mn²⁺5(SiO4)2(OH)2
Apparent epitaxic overgrowth of richardsite on selective facets of primary wurtzite–sphalerite crystals. The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Mineral

Richardsite

richardsite
Holotype specimen of richardsollyite (dark grey) with hutchinsonite (dark red) and realgar. Field of view: 3.5 mm. Mineralogical Collection of the Musée cantonal de géologie (MGL no. 080126), photo: Stefan Ansermet. From Lengenbach quarry. Mineral

Richardsollyite

richardsollyite

Formula
TlPbAsS3
Mineral

Richellite

richellite

Formula
CaFe³⁺2(PO4)2(OH,F)2
Richelsdorfite Locality: Wilhelm Mine (Wechselschacht), Bauhaus, Richelsdorf District, North Hesse, Hesse, Germany Field of view 4 mm. Specimen and photo Leon Hupperichs. Mineral

Richelsdorfite

richelsdorfite

Formula
Ca2Cu5Sb(AsO4)4(OH)6Cl * 6H2O
Mineral

Richetite

richetite

Formula
(Fe³⁺,Mg)Pb 8.6(UO2)36O36(OH)24*41H2O
Richterite is a member of the amphibole group with the chemical formula of Na2Ca(Mg,Fe)5Si8O22(OH)2. It basically is the sodium rich version of tremolite. Some richterite has been found in meteorite debris and it is not an overly common mineral, but is found in small amounts in many rocks. This sample is about 7 cm. Mineral

Richterite

richterite

Formula
Na(NaCa)Mg5Si8O22(OH)2
Rickardite Locality: Good Hope Mine, Vulcan District, Gunnison County, Colorado (Locality at mindat.org) A very metallic, bright specimen showing lathe-shaped crystals of tellurium admixed with sparkling rickardite in microcrystals around it. Rickardite is a SUPER RARE copper telluride, first discovered here in the early 1900s. This specimen, formerly #17583 in the AMNH collection, surely dates to those early days. It comes with an AMNH label showing it was a gift from an FJ Arkins (I do not know of him). Good Hope Mine, Vulcan District, Gunnison Co., Colorado is the TYPE LOCALE. Ex AMNH exchanged into the collection of dealer/collector Lawrence Conklin. 2.7 x 2.1 x 1.4 cm. Mineral

Rickardite

rickardite

Formula
Cu3-ₓTe2
Mineral

Rickturnerite

rickturnerite

Formula
Pb7O4[Mg(OH)4](OH)Cl3
Riebeckite (Var.: Riebeckite) Locality: Prieska District, Namaqualand, Northern Cape Province, South Africa (Locality at mindat.org) Size: 7.6 x 3.9 x 2.8 cm. Crocidolite is a form of riebeckite [Na2][Fe2+3Fe3+][(OH)2|Si8O22], which is easily apparent when you see the specimens densely-packed hair-like fibers. This variety is often called "blue asbestos" due to its deep blue-black color. This is an old-time piece from mining in South Africa. Fortunately, it was not used much commercially in the U.S., because it turned out to be perhaps the worst perpetrator of asbestos lung disease. Ex. Mullane Collection. Mineral

Riebeckite

riebeckite

Formula
☐Na2(Fe²⁺3Fe³⁺2)Si2O22(OH)2
Mohs
6