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Sternbergite, Pyrargyrite Locality: Jáchymov (St Joachimsthal), Jáchymov (St Joachimsthal) District, Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic (Locality at mindat.org) EYE-VISIBLE crystals of sternbergite line 80% of the top ridge of this remarkable old specimen, which I received at Tucson in exchange from Bill Pinch. It is a large and very rich specimen for this rare silver species! The crystals are to 1 mm (though most are smaller than that and are sparkly sub-mm crystals), and although the species gets bigger it is but rarely and seldom in any large clusters as we see here. There are literally hundreds of crystals here and the piece could easily be chopped in portions for sale at higher prices in total. Comes with old label from Schortmann's Minerals (1940's). 13 x 7 x 3.5 cm Mineral

Sternbergite

sternbergite

Formula
AgFe2S3
Very nice specimen of steropesite, a exceptionally rare thallium mineral (IMA 2008-014) of formula Tl3BiCl6 from La Fossa Crater (Vulcano Island, Aeolian Islands, Sicily, Italy). Mineral

Steropesite

steropesite

Formula
Tl3BiCl6
Sterryite, a silver lead sulphosalt, is a very rare mineral present only in two localities worldwide, being this one in Apuan Alps the best by far. From: Pollone Mine, Valdicastello Carducci, Lucca, Tuscany, Italy. Mineral

Sterryite

sterryite

Formula
Cu(Ag,Cu)3Pb19(Sb,As)22(As-As)S56
Yellow stetefeldtite on matrix. From: Belmont, Nye County, Nevada, United States of America. Mineral

Stetefeldtite

stetefeldtite
Mineral

Stetindite-(Ce)

stetindite-(Ce)

Formula
Ce(SiO4)
Mineral

Steudelite

steudelite
Stevensite Locality: Långban, Filipstad, Värmland, Sweden (Locality at mindat.org) Size: 8.9 x 5.9 x 4.4 cm. First identified in specimens from a railway tunnel at Bergen Hill in Hudson County, New Jersey, (Ca0.5,Na)0.33(Mg,Fe++)3Si4O10(OH)2•n(H2O), Stevensite is a little-known phyllosilicate in the smectite group. This is an old specimen from Langban - accompanied by an old label calling it "Aphrodite." Mineral

Stevensite

stevensite

Formula
(Ca,Na)xMg3-x(Si4O10)(OH)2
Steverustite Field of view: 0.5 mm Locality: Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK (locality at mindat.org) Mineral

Steverustite

steverustite

Formula
Pb²⁺5(OH)5[Cu¹⁺(S⁶⁺O3S²⁻)3](H2O)2
Stewartite Locality: Hagendorf South Pegmatite (Cornelia Mine; Hagendorf South Open Cut), Hagendorf, Waidhaus, Vohenstrauß, Oberpfälzer Wald, Upper Palatinate, Bavaria, Germany (Locality at mindat.org) Picture width 1,5 mm. Collection and photograph Christian Rewitzer Mineral

Stewartite

stewartite

Formula
Mn²⁺Fe³⁺2(PO4)2(OH)2 * 8H2O
Stibarsen Locality: American Eagle; Luona Occurrence, Elk Mountain District, Gunnison County, Colorado, USA (Locality at mindat.org) Size: 4.7 x 3.2 x 3.2 cm. This is a rich specimen of stibarsen, with spheroidal nodules and massive seams in ore matrix. Even though the label has somehow been lost since then, we know that this is not a European specimen and so is either from Gunnison Co., Colorado or from Ophir Mine in the Comstock Lode, Nevada. However the Nevada locality has no associations of red minerals listed as occurring there, while several occur in the Colorado locale - and this piece has small red flecks of two different species present on it. So although the locality is given without a confirming label, we think it to be a correct one. Ex. Academy of Natural Sciences Philadelphia Collection. Mineral

Stibarsen

stibarsen

Formula
SbAs
Stibiconite Locality: Catorce (Real de Catorce), Municipio de Catorce, San Luis Potosí, Mexico (Locality at mindat.org) A sharp stibnite crystal that has been replaced by the mineral stibiconite, retaining the original form perfectly. These are not the most beautiful of mineral specimens, but they deserve respect as a classic from San Luis Potosi. 7 x 1 x 0.8 cm Mineral

Stibiconite

stibiconite

Formula
Sb³⁺Sb⁵⁺2O6(OH)
1.7 x 0.4 x 0.2 cm. Leiteite is a very rare arsenic antimony oxide, named in 2007 from a single specimen found at Tsumeb. This exceptional, single crystal is gemmy, lustrous, and sharp. This is a superb and important example of the species. Ex Mark Rattay and Marshall Sussman (from his important rarities suite, sold off in 2003 to me). Originally labeled as leiteite, but analysis found the specimen to be stibioclaudetite. Locality: Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia Mineral

Stibioclaudetite

stibioclaudetite

Formula
AsSbO3
Black crystals of the very rare mineral stibiocolumbite from Mesa Grande District, San Diego County, California, United States of America. Mineral

Stibiocolumbite

stibiocolumbite

Formula
SbNbO4
Mineral

Stibiocolusite

stibiocolusite

Formula
Cu13VSb3S16
Holotype (sample P1P 78/2020) specimen of stibiogoldfieldite. Reflected light images of holotype stibiogoldfieldite, as anhedral grains up to 0.6 mm across in quartz. Field of view: 0.6 mm. 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

Stibiogoldfieldite

stibiogoldfieldite
Stibiopalladinite Locality: Tilkerode, Harz, Germany Exposed in the Mineralogical Museum of University Bonn, Germany Mineral

Stibiopalladinite

stibiopalladinite

Formula
Pd5Sb2
(a) Stibiosegnitite aggregates (olive-green) on quartz with pseudomalachite (bluish-green on stibiosegnitite) and malachite (green on quartz). Holotype sample. 8 × 8 × 6 cm. Photo by Maria D. Milshina. (b) Crust of stibiosegnitite pseudo-cuboctahedral crystals; fragment of holotype sample. Scanning electron microscopy image, SE mode. Mineral

Stibiosegnitite

stibiosegnitite

Formula
Pb(Fe³⁺2.5Sb⁵⁺0.5)(AsO4)2(OH)6
Stibiotantalite Locality: Himalaya Mine (Himalaya pegmatite; Himalaya dikes), Gem Hill, Mesa Grande District, San Diego County, California, USA (Locality at mindat.org) Size: thumbnail, 3.2 x 2.1 x 0.6 cm Stibiotantalite This perfect, equant, textbook-quality crystal is a very significant example of this rare species for San Diego, of which few better exist. I recall the handwringing it caused when Chuck traded this from Irv Brown in the mid-1990s. By any standard, this is a beautiful example of the species from any US locale. Ex. Chuck Houser Collection. Mineral

Stibiotantalite

stibiotantalite

Formula
Sb³⁺TaO4
Back-scattered electron (BSE) image of the sample studied containing arsenoústalečite (red circles), stibioústalečite (blue circles), hakite-(Hg) (green circles), berzelianite (dark grey in BSE) and uraninite (white in BSE). The grains used for single-crystal X-ray diffraction study were extracted from the red (arsenoústalečite) and blue (stibioústalečite) boxes. Holotype sample. Mineral

Stibioústalečite

stibioústalečite

Formula
Cu6Cu6(Sb2Te2)Se13
Mineral

Stibivanite

stibivanite

Formula
Sb2VO5
Antimonit Quarz aus der Grupe Shikawa, Shikoku in Japan im Museum Mineralogia München Mineral

Stibnite

stibnite

Formula
Sb2S3
Stichtite and lizardite Locality: Stichtite Hill, Dundas mineral field, Zeehan District, Tasmania, Australia Size :15 × 14 cm. Mineral

Stichtite

stichtite

Formula
Mg6Cr2CO3(OH)16·4H2O
Apophyllite-(KF), Stilbite-Ca Locality: Jalgaon District, Maharashtra, India (Locality at mindat.org) Size: 6.4 x 5.9 x 4.2 cm. A bloom of salmon-pink stilbite right beside a super-gemmy, brilliant apophyllite crystal - from Jalgaon. Ex. Feist Collection. Mineral

Stilbite-Ca

stilbite-Ca

Formula
NaCa4(Si27Al9)O72·28H2O
Mineral

Stilbite-Na

stilbite-Na

Formula
Na9(Si27Al9)O72·28H2O