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Minerals

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Mineral

Gladkovskyite

gladkovskyite

Formula
MnTlAs3S6
Mineral

Glagolevite

glagolevite

Formula
Na(Mg,Al)6(AlSi3O10)(OH,O)8
Glauberite Locality: Bertram Mine (Bertram Siding Sulfate deposit; Bertram Sodium Sulphate deposits), Bertram siding, Imperial County, California, USA (Locality at mindat.org) Size: 4.1 x 2.9 x 2.3 cm. This California glauberite specimen (not a pseudo) is a flattened crystal, in this case with clusters of small crystals sticking out of both sides. Ex. Carlton Davis Collection. Mineral

Glauberite

glauberite

Formula
Na2Ca(SO4)2
Glaucocerinite (Size: 7.7 x 5.2 x 1.8 cm) Locality: Lavrion (Laurion; Laurium), Lavrion District Mines, Lavrion (Laurion; Laurium) District, Attikí (Attica; Attika) Prefecture, Greece (Locality at mindat.org) Glaucocerinite is a fairly rare zinc copper aluminum sulfate that is only found in a handful of worldwide localities. The mineral is known for it's amazingly beautiful blue hues, which makes sense since it's name is derived from the word Glaucous (the Latin glaucus means "bluish-grey or green", and the Greek glaukos is used to describe the pale grey or bluish-green appearance of the surfaces of some plants). Laurion is the most well-known locality for this mineral, along with being the type locality. This piece is an excellent Glaucocerinite featuring dozens of small greenish-blue botryoids on matrix. Mineral

Glaucocerinite

glaucocerinite

Formula
(Zn1-xAlx)(OH)2(SO4)x/2 * nH2O
Mohs
1
Glaucochroite Locality: Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA Description: This is a child photo. Previous (not too useful) stereo image replaced Dec 2012 with a full res image using a dark background. Under these conditions, the glaucochroite looks quite pinkish. But it looks pale blue in daylight or under CFL. Mineral

Glaucochroite

glaucochroite

Formula
CaMn²⁺(SiO4)
Mohs
6
Glaucodot Locality: Håkansboda, Lindesberg, Västmanland, Sweden (Locality at mindat.org) Size: 3.3 x 2.7 x 2.6 cm. A remarkable and LARGE, 40-gram crystal of this rare complex iron-cobalt sulfide. It is complete all around except for a contact on the bottom and one small contact or old damage in a 7 x 5 mm edge on one face. It is geometric and very 3-dimensional, displayable from 3 sides thus. Ex. Phillipstad Museum Collection in Sweden (over 50 years ago). Mineral

Glaucodot

glaucodot

Formula
(Co0.5Fe0.5)AsS
Mohs
5
Glaucophane and Fuchsite (Var. of Muscovite) Locality : Groix Island, Groix, Morbihan, Brittany, France Size 6.5 x 5.2 x 3.6 cm Mineral

Glaucophane

glaucophane

Formula
☐Na2(Mg3Al2)Si8O22(OH)2
Mohs
6
Glaukosphaerite Locality: Kasompi Mine (Menda Mine; Kasompi Hill), Swambo, Central area, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre) (Locality at mindat.org) Size: small cabinet, 6.2 x 3.6 x 2.6 cm Glaukosphaerite Kasompiite, as shown on the accompanying label, was the old name given to material from this mine now known to be the already named mineral species Glaukosphaerite. This is a rare copper-nickel carbonate, and few deposits produce beautiful examples. This is a large, attractive, velvety looking specimen rich with mattes of the mineral on gangue matrix. It has a noticeable bit too much heft for malachite. But, it looks like velvety malachite on first glance. Ex. John White Collection. Mineral

Glaukosphaerite

glaukosphaerite

Formula
CuNi(CO3)(OH)2
Mohs
3.5
Colour
green
Mineral

Glecklerite

glecklerite

Formula
Na(C2H3O3)
Mineral

Glikinite

glikinite

Formula
Zn3O(SO4)2
White crystals of the rare Ca-Be phosphate mineral glucine from the type locality in Russia (Boevskoe Be Deposit, Kaslinsky District, Chelyabinsk Oblast, Russian Federation). Only two known localities worldwide. Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Glucine

glucine

Formula
CaBe4(PO4)2(OH)4·0.5H2O
Mineral

Glushinskite

glushinskite

Formula
Mg(C2O4)·2H2O
Mohs
2
Figure 4. Holotype specimen of gmalimite. (B) Gmalimite aggregate with pyrrhotite and pyrite inclusions within goethite rim. Reflected light. Gmalimite exhibits characteristic gray-olive color. Fap—fluorapatite, Gh—gehlenite, Gma—gmalimite, Gth—goethite, Py—pyrite, Pyh—pyrrhotite, Zeo—zeolite. Mineral

Gmalimite

gmalimite

Formula
K6◻Fe²⁺24S27
Gmelinite-Ca Locality: Sarbaiskoe deposit (Sarbai; Sarbay Mine), Qostaney Oblysy (Kostanai [Kustany] Oblast'), Kazakhstan (Locality at mindat.org) Size: 7.9 x 5.9 x 5.1 cm. Rudnyi is best known for its beautiful yellow calcites, but here is a rare zeolite from the locality: a rich specimen of gmelinite, with translucent, salmon-colored crystals that are quite sizeable and eye-visible covering the entire face of the matrix. Mineral

Gmelinite-Ca

gmelinite-Ca

Formula
Ca2(Si8Al4)O24·11H2O
Gmelinite-K from the famous Lovozero region in Russia. Mineral

Gmelinite-K

gmelinite-K

Formula
K4(Si8Al4)O24·11H2O
Gmelinite-Na Locality: Flinders, Victoria, Australia (Locality at mindat.org) Gmelinite is one of the lesser-known and rarer zeolite minerals (hydrated sodium calcium aluminum silicate). There are well-formed crystals here of the very unique angular "flying saucer" shape the best crystals show. Good luster on the faces, too! 7.4 x 5.8 x 2.7cm Mineral

Gmelinite-Na

gmelinite-Na

Formula
Na4(Si8Al4)O24·11H2O
Gobbinsite, Gmelinite-Na (FOV 6.8 x 4.6 mm) Locality: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada Found June 1997. MOB coll. From the Poudrette pegmatite contact zone area. This one has a rather dark rosette of gmelinite-Na sitting on it. This is a common combination. Mineral

Gobbinsite

gobbinsite

Formula
Na5(Si11Al5)O32·11H2O
Lath-shaped pale-greenish crystals of gobelinite from pillar 78b, Cap Garonne, France. Field of view is 1 mm. Photo: Pierre Clolus. Collection: Valérie Galea-Clolus. The image is published in an article (https://doi.org/10.5194/ejm-32-637-2020) distributed under the Creative Commons Attribution 4.0 License. Mineral

Gobelinite

gobelinite
Metallic silvery nugget of the very rare mineral godlevskite from the famous Norilsk region, included the epoxy resin that was used for the analysis. Analyzed specimen by SEM/EDS. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Godlevskite

godlevskite

Formula
(Ni,Fe)9S8
White godovikovite with minor red demicheleite-(Cl) (IMA 2008-020). From: La Fossa Crater, Vulcano Island, Messina Province, Sicily, Italy. Mineral

Godovikovite

godovikovite

Formula
(NH4)Al(SO4)2
Typical association from Palermo mine (Palermo 1 Mine, Grafton County, New Hampshire, United States of America): crystals of goedkenite grown on prismatic crystals of palermoite. Goedkenite is a Sr phosphate known from only two localities worldwide while palermoite is another Sr phosphate that has only been found in the three localities worldwide. This specimen is from the type locality for both species. Mineral

Goedkenite

goedkenite

Formula
Sr2Al(PO4)2(OH)
Vanadinite, goethite 9 - Mibladen Mining District, Midelt, Khénifra Province, Meknès-Tafilalet Region, Morocco Mineral

Goethite

goethite

Formula
FeO(OH)
Red Lake Gold Ore (6.6 cm across at its widest) - highly concentrated network of gold-filled veinlets (gold veinlet stockwork) in biotite-carbonate altered, partially silicified metabasalt. Black = altered basalt; whitish-gray = quartz; gold = native Au. The crusts of gold are Au-filled fractures broken along the plane of the veinlets. Other Au-filled veinlets can be seen in cross-section view. This rock leaves me speechless, in terms of its gold content and beauty. This is a sample of extremely high grade gold ore from the richest gold mine on Earth - northwestern Ontario’s Red Lake Mine. The rocks and mineralization features in this area are fairly complex. The host rock here is a metamorphosed tholeiitic basalt dating to ~2.85 billion years (early Neoarchean). This basalt has been subjected to biotite-carbonate alteration and auriferous silicification. In addition to gold, the sample has a fair amount of biotite, some carbonate (it fizzes in acid), and many small, black rods of tourmaline. It also has patches of glassy gray quartz. Geologic Provenance: extremely high-grade gold ore, possibly from the HWA Vein (Hanging Wall A Vein), upper High Grade Zone (HGZ; a.k.a. Goldcorp High Grade Zone), Balmer Assemblage, Red Lake Greenstone Belt, Uchi Subprovince, Superior Province. Age: ~2.85 billion year host rock (altered basalt) with hydrothermal metamorphism and gold mineralization at 2.712-2.723 billion years (during collision-related emplacement of several nearby igneous intrusions - Uchian Phase of the Kenoran Orogeny) & at 2.63-2.66 or 2.699 billion years (during a regional thermal event or another igneous intrusive event). Comment: the sample shown here is very similar to those shown in figures 18 and 19 of Dubé et al. (2001, The Goldcorp High Grade Zone, Red Lake Mine, Ontario: a photographic atlas of the main geological features. Geological Survey of Canada Open File 3890), which illustrate extreme high grade gold ores from Red Lake Mine's level 34. Rocks from the Goldcorp High Grade Zone average about 80 to 81 ounces of gold per ton of rock. Locality: unrecorded locality in the Red Lake Mine, northeastern side of Balmertown, just south of Balmer Lake, Campbell-Red Lake Gold District, northwestern Ontario, south-central Canada. Mineral

Gold

Formula
Au
Mohs
2.5–3
Colour
Golden yellow
SEM image. The maletoyvayamite-quartz association in the sample 3053-3_b, highest enrichment in noble metals (Au is 144 ppm, Ag is 200 ppm); (a) ore minerals localized along cracks in the intergranular space of quartz; (b) maletoyvayamite confined to the margins of sulfosalts grains; mlt—maletoyvayamite, gdf—goldfieldite, wtb—watanabeite, Te0.9Se0.1—Te-Se solid solution. Mineral

Goldfieldite

goldfieldite

Formula
(Cu4☐2)Cu6Te4S13