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Minerals

6323 results

Mineral

Riesite

riesite

Formula
TiTiO4
Rietveldite, Gypsum, Ferricopiapite (Field of view 1.55 mm)) Locality: Giveway-Simplot Mine, Red Canyon, White Canyon District, San Juan Co., Utah, USA Original description: Tiny euhedral rietveldite crystals sprinkled on black asphaltum matrix. Associated minerals include colorless gypsum and yellow ferricopiapite. Horizontal field of view is 1.55 mm. Collected 2006 Mineral

Rietveldite

rietveldite

Formula
Fe(UO2)(SO4)2(H2O)5
Mohs
2
Mineral

Rigrahamite

rigrahamite

Formula
Na2Ca2Th2(CO3)4(HCO3)2(OH)4(H2O)7
Dark brown almost black crystal aggregates of the extremely rare chromium mineral rilandite from the type and only known locality worldwide, the Riland mine in Colorado (Riland Uranium Claim, Meeker, Rio Blanco County, Colorado, United States of America). Ex.Vandenbroucke collection. Mineral

Rilandite

rilandite

Formula
Cr6SiO11·5H2O (?)
Rimkorolgite Locality: Zheleznyi Mine (Iron Mine), Kovdor Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia (Locality at mindat.org) Light brown acicular crystals of Rimkorolgite. Field of view 5 mm. Specimen and photo Leon Hupperichs. Mineral

Rimkorolgite

rimkorolgite

Formula
(Mg,Mn)5(Ba,Sr,Ca)(PO4)4 * 8H2O
Ringwoodite Blue crystal ~150 micrometers across. Mineral

Ringwoodite

ringwoodite

Formula
SiMg2O4
Ex Ron Waddell (found 1975). MOB Coll. Orange/brown rinkite prisms to ~ 3¼ mm embedded in very dark purple fluorite with pale greenish fluorapatite. Some of the rinkite appears to be well terminated. There are several examples of terminated sprays on the specimen, This is part of [1] – which see for comments on the ID. Most of the apatite prisms (to ~ 15 mm long and as much as 6+ mm in diameter) are broken or embedded. For an example of an intact termination see [2]. Modified by CombineZP Mineral

Rinkite-(Ce)

rinkite-(Ce)

Formula
(Ca3REE)Na(NaCa)Ti(Si2O7)2(OF)F2
White rinkite-(Y) crystal aggregates from Canada ( Kipawa, Sheffield Lake, Les Lacs-du-Témiscamingue, Abitibi-Témiscamingue, Québec, Canada). Col. 2018 by R.Mielke. EDS by Pavel Kartashov. Ex. Erich Laskowski collection (USA). Mineral

Rinkite-(Y)

rinkite-(Y)

Formula
Na2Ca4YTi(Si2O7)2OF3
Black sharp crystals of the very rare mineral rinmanite on a contrasting matrix from the second known worldwide locality for the mineral: Babuna Valley, Jakupica Mountains, Nežilovo, Veles, Macedonia. Mineral

Rinmanite

rinmanite

Formula
ZnSb⁵⁺(Fe³⁺2Mg)O7(OH)
Rinnetite (in a glass for protection from degradation due to humidity) Locality: Nordhäuser Kaliwerke, Schacht I, Wolkramshausen, Thuringia, Germany Exposed in the Mineralogical Museum of University Bonn, Germany Mineral

Rinneite

rinneite

Formula
K³NaFe²⁺Cl6
Mohs
3
Mineral

Riomarinaite

riomarinaite

Formula
Bi(SO4)(OH) * H2O
White crystals of the extremely rare aluminium mineral riotintoite from the type and only known locality worldwide: La Vendida Mine, Sierra Gorda, Antofagasta Region, Chile. Mineral

Riotintoite

riotintoite

Formula
Al(SO4)(OH)*3H2O
Mineral

Rippite

rippite

Formula
K2(Nb,Ti)2(Si4O12)O(O,F)
White fibrous spheres of nordgauite and yellow crystals of rittmannite. Ex Jürgen Kastning collection. From: Silbergrube, Waidhaus, Neustadt an der Waldnaab, Upper Palatinate, Bavaria, Germany. Mineral

Rittmannite

rittmannite

Formula
(Mn²⁺,Ca)Mn²⁺(Fe²⁺,Mn²⁺,Mg)2(Al,Fe³⁺)2(PO4)4(OH)2(H2O)8
White single crystals of the rare borate mineral rivadavite from the type locality in Argentina and only one of the three known localities worlwide (Tincalayu Mine, Salar Del Hombre Muerto, Los Andes, Salta, Argentina). Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Rivadavite

rivadavite

Formula
Na6Mg[B6O7(OH)6]4 * 10H2O
Riversideite Locality: Crestmore quarries, Crestmore, Riverside County, California, USA (Locality at mindat.org) Size: 7.6 x 7.5 x 4.4 cm. Named after its discovery locality circa 1917, this is an old matrix specimen showing several veins of striated, parallel-grown crystals of this rare silicate. The Riversideite is embedded in matrix with gemmy olive-green vesuvianite crystals. Ex. Philadelphia Academy of Sciences and Smithsonian Institution Collections. Mineral

Riversideite

riversideite

Formula
Ca5Si6O16(OH)2·2H2O
Mineral

Roaldite

roaldite

Formula
(Fe,Ni)4N
Robertsite, Beraunite Locality: Hagendorf South Pegmatite (Cornelia Mine; Hagendorf South Open Cut), Hagendorf, Waidhaus, Vohenstrauß, Oberpfälzer Wald, Upper Palatinate, Bavaria, Germany (Locality at mindat.org) Small reddish brown Robertsite spheres on Beraunite. Field of view 4mm. Specimen and photo Leon Hupperichs. Mineral

Robertsite

robertsite

Formula
Ca2Mn³⁺3(PO4)3O2(H2O)2·H2O
Elongated crystals of rouxelite, bluish, metallic luster and with thick section. It is accompanied by small and thin acicular crystals of robinsonite, red copper color, in the midst of larger crystals of rouxelite. Finding of late 2014. Analyzed by Stefano Magnanelli and Christian Biagioni. Not many specimens were collected. Collected: 2014 Locality: Monte Arsiccio Mine, Apuan Alps, Tuscany, Italy Size: 6.2 × 4.4 × 2.7 cm Mineral

Robinsonite

robinsonite

Formula
Pb4Sb6S13
Phosphosiderite, Rockbridgeite Locality: Indian Mountain, Cherokee Co., Alabama Size: miniature, 5.2 x 4.5 x 3.2 cm Rockbridgeite over Phosphosiderite (?) A rare example of the classic phosphates from this locality, which are seldom seen as anything but smudges. Yet, this piece is actually quite rich and attractive! Mineral

Rockbridgeite

rockbridgeite

Formula
Fe²⁺Fe³⁺4(PO4)3(OH)5
Rodalquilarite Locality: Wendy open pit, Tambo Mine, El Indio deposit, Elqui Province, Coquimbo Region, Chile (Locality at mindat.org) Picture width 4 mm. Collection and photograph Christian Rewitzer This Photo was Mindat.org Photo of the Day - 18th Aug 2008 Mineral

Rodalquilarite

rodalquilarite

Formula
Fe2(TeO2OH)3(TeO3)Cl
Colour
green
Rodolicoite, Grattarolaite Locality: Castelnuovo Mine, Santa Barbara lignite District, Cavriglia, Valdarno (Val d'Arno), Arezzo Province, Tuscany, Italy Brown crystals of Rodolicoite intimately intergrown with Grattarolaite, pseudo after Vivianite. Field of view 3 mm. Specimen and photo Leon Hupperichs. Mineral

Rodolicoite

rodolicoite

Formula
Fe³⁺PO4
Agate Mineral

Roeblingite

roeblingite

Formula
Ca6Mn²⁺Pb2(Si3O9)2(SO4)2(OH)2·4H2O
Sharp yellow roedderite crystals from this classic German locality. From: Bellerberg, Ettringen, Eifel Mountains, Germany. Mineral

Roedderite

roedderite

Formula
KNaMg2(Mg3Si12)O30
Mohs
6.5