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Mineralati

Minerals

6323 results

Black sharp crystals of the rare mineral graeserite from an Italian locality (Monte Arsiccio Mine, Sant'Anna di Stazzema, Stazzema, Lucca Province, Tuscany, Italy). Graeserite is named after the well known Swiss mineralogist expert on Lengenbach minerals Stefan Graeser. Ex. Erich Laskowski collection (USA). Mineral

Graeserite

graeserite

Formula
Fe³⁺4Ti3As³⁺O13(OH)
These mineral images are free to use how you wish. Mineral

Graftonite

graftonite

Formula
Fe²⁺Fe²⁺2(PO4)2
(B) The only known harrisonite grain from Cyrilov, Czech Republic, in paragenesis with Fe-Mn phosphates staněkite (Stk), heterosite (Het), graftonite-(Mn) (Gft-Mn) and graftonite-(Ca) (Gft-Ca; BSE image). Mineral

Graftonite-(Ca)

graftonite-(Ca)

Formula
CaFe²⁺2(PO4)2
(B) The only known harrisonite grain from Cyrilov, Czech Republic, in paragenesis with Fe-Mn phosphates staněkite (Stk), heterosite (Het), graftonite-(Mn) (Gft-Mn) and graftonite-(Ca) (Gft-Ca; BSE image). Mineral

Graftonite-(Mn)

graftonite-(Mn)

Formula
MnFe²⁺2(PO4)2
Mineral

Grahampearsonite

grahampearsonite

Formula
Ca2P2O7
Sharp grammacioliite-(Y) crystals from the type and most famous locality for the mineral: Sambuco Gramaccioliite Site, Valle Stura, Cunoe, Piedmont, Italy Mineral

Gramaccioliite-(Y)

gramaccioliite-(Y)

Formula
(Pb,Sr)(Y,Mn)Fe³⁺2(Ti,Fe³⁺)18O38
Digital image in reflected plane polarized light (A) and back-scattered electron image (C) showing eliopoulosite from the chromitite of Agios Stefanos. Abbreviations: Elp = eliopoulosite, Grm = grammatikopoulosite, Tsk = tsikourasite, Aw = awaruite, Npd = nickelphosphide, Epx = epoxy. 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

Grammatikopoulosite

grammatikopoulosite
Piccoliite from the two Italian occurrences. (b) Black crystals of piccoliite associated with grandaite from the Valletta mine dump. Field of view 5 mm. Collection and photo Roberto Bracco. The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Mineral

Grandaite

grandaite

Formula
Sr2Al(AsO4)2(OH)
Grandidierite Locality: Cap Andrahomana, Ranopiso Commune, Taolañaro (Fort Dauphin) District, Anosy (Fort Dauphin) Region, Tuléar (Toliara) Province, Madagascar (Locality at mindat.org) Size: 2.5 x 2.0 x 1.6 cm. Sharply crystallized examples of this species are very rare. This is the type locality, from which specimens were recovered around 1900 and identified in 1902. This is a rare magnesium, aluminum oxide, borate silicate and here occurs in lustrous, slightly translucent, sky blue crystals, to 1.5 cm across. This ENTIRE CLUSTER is composed of sharp tabular crystals, although with some contacts at the edges. Mineral

Grandidierite

grandidierite

Formula
(Mg,Fe²⁺)(Al,Fe³⁺)3(SiO4)(BO3)O2
Mineral

Grandreefite

grandreefite

Formula
Pb2(SO4)F2
GRCA_108407_ While Grand Canyon is most famous for vast views of towering cliffs, it holds additional geologic treasures, some as tiny as the delicate blue-green needles of a grandviewite crystal. Pete Berry and partners developed the Grandview Mine from two mining claims filed in 1890. The Grandview Trail was built in 1892-1893 to service the mine to haul ore out of the canyon by pack train. The ore consisted mostly of copper sulfate minerals including cyanotrichite, brochantite, and chalcoalumite, along with copper carbonates such as azurite and malachite. Like many historic mines in Grand Canyon, including the Orphan Mine, the mineralized zone is in a breccia pipe, which is a cylindrical mass of highly fractured rock. In the Grand Canyon region, breccia pipes formed from the collapse of solution caverns in the Redwall Limestone. The highly porous brecciated rock in these features was mineralized by copper- and/or uranium-bearing fluids. Learn more here: <a href="http://www.nps.gov/grca/naturescience/cynsk-v25.htm" rel="nofollow">www.nps.gov/grca/naturescience/cynsk-v25.htm</a> NPS photo by Michael Quinn Mineral

Grandviewite

grandviewite

Formula
Cu3Al2(SO4)(OH)10·H2O
Outstanding brown rounded crystal aggregtes of the rare mineral grantsite from Agios Konstantinos (Lavrion District, Attiki Prefecture, Greece). Mineral

Grantsite

grantsite

Formula
(Na,Ca)²⁺x(V5+,V4+)6O16 * 4H2O
GraphiteUSGOV Mineral

Graphite

Formula
C
Mohs
1–2
Colour
Steel-grey to black
Gratonite Locality: Excelsior Mine, Cerro de Pasco, Daniel Alcides Carrión Province, Pasco Department, Peru (Locality at mindat.org) Size: thumbnail, 2.2 x 1.2 x 1.2 cm Gratonite I must say that this is one of the most aesthetic gratonite specimens I have seen. They are truly rare on the market, having come out mostly in the 1930s (or perhaps only then - I often hear of a few small finds dating to that time, and have heard of no more since). The overall doublet or hourglass form is spectacular, made up of individual crystals to 2.5 mm across in radiating rosettes. What is nice is that this is a full sized thumbnail tha tis more than the usual stubby lump with pokey crystals...it actually has some elegance. A truly competition quality thumbnail, gratonite is a rare lead, arsenic, sulfide. This specimen is also from the type locality. Mineral

Gratonite

gratonite

Formula
Pb9As4S15
Mohs
2.5
Mineral

Grattarolaite

grattarolaite
Mineral

Graulichite-(Ce)

graulichite-(Ce)

Formula
CeFe³⁺3(AsO4)2(OH)6
Graulichite-(La), as yellow rhombohedral crystals with thin needles of agardite-(La). Field of view: 0.5 mm. Collection Georges Favreau, photo Pierre Clolus. 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

Graulichite-(La)

graulichite-(La)

Formula
LaFe³⁺3(AsO4)2(OH)6
Olive green microcrystals of the extremely rare mineral gravegliaite grown on a big perfect alabandite crystal, from the classic locality of Merelani (Merelani Hills, Arusha Region, Tanzania (United Republic)). Analyzed specimen. Mineral

Gravegliaite

gravegliaite
These specimens show yellowish nodules included in a feldspar matrix. First SEM-EDS analysis have yielded a phosphate of Th and Ca, with minor Pb. XRD has shown patterns of "bravantite", the old name for cheralite and brockite. The chemical base formula for these species are: grayite (Th,Pb,Ca)(PO4)·H2O; cheralite CaTh(PO4)2; brockite (Ca,Th,Ce)(PO4)·H2O. REE has not been found in EDS. We could say that this yellow nodules belongs from altered monazite, formed by mixed species cheralite-grayite, with minor brockite. Accompanied in matrix by meta-autunite. From: Brabant Farm 168, Karibib, Erongo, Namibia. Size: 5.3 × 3.7 × 3 cm. Mineral

Grayite

grayite

Formula
(Th,Pb,Ca)(PO4)·H2O
Mineral

Graţianite

graţianite

Formula
MnBi2S4
Mineral

Grechishchevite

grechishchevite
Dark green crystal group of greenalite from Kyoto Prefecture, Honshu Island, Japan. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Greenalite

greenalite

Formula
(Fe²⁺,Fe³⁺)2-3Si2O5(OH)4
Mineral

Greenlizardite

greenlizardite

Formula
(NH4)Na(UO2)2(SO4)2(OH)2·4H2O
Greenockite Locality: Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia (Locality at mindat.org) Picture width 1 mm. Collection and photograph Christian Rewitzer Mineral

Greenockite

greenockite

Formula
CdS