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A lot of black single crystal aggregates of the extremely rare selenium mineral stilleite from the famous deposit of Shinkolobwe (Shinkolobwe Mine, Shinkolobwe, Kambove, Haut-Katanga, DR Congo), that it is the type locality. Stilleite is the selenium analog of sphalerite. Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Stilleite

stilleite

Formula
ZnSe
A selection of backscatter electron (BSE) images of platinum-group minerals identified in the till samples. (a) Braggite ((Pt,Pd,Ni)S); (b) Cooperite (PtS); (c) Moncheite ((Pt,Pd)(Te,Bi)2); (d) Stillwaterite (Pd8As3); (e) Mertieite-II (Pd8(Sb,As)3); (f) Taimyrite ((Pd,Cu,Pt)3Sn); (g) Cabriite (Pd2SnCu); (h) Isomertieite (Pd11Sb2As2); (i) Paolovite (Pd2Sn); (j) Potarite (PdHg); (k) Stibiopalladinite (Pd5Sb2); (l) Platinum (Pt). The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license. Mineral

Stillwaterite

stillwaterite

Formula
Pd8As3
Stillwellite-(Ce) Locality: Darai-Pioz (Dara-i-Pioz; Dara-Pioz) Glacier, Alai (Alayskiy) Range, Tien Shan Mts, Region of Republican Subordination, Tajikistan (Locality at mindat.org) This is one of the better crystals collected in a remakrable pocket from a glacial region, in september of 2004. It features a 1.3 cm crystal in matrix. Interestingly, they COLOR CHANGE from red (as shown) in halogen or sunlight to YELLOW in fluorescent light. Superb crystal form and lustre for the species, as well as unusually attractive for such a normally earthy species. They are translucent and partly gemmy, if not transparent per se. 4 x 2.3 x 2.1 cm Mineral

Stillwellite-(Ce)

stillwellite-(Ce)

Formula
CeBSiO5
Mineral

Stillwellite-(La)

stillwellite-(La)

Formula
LaBSiO5
Stilpnomelane Locality: Sterling mine, Antwerp, Jefferson County, New York, USA (Locality at mindat.org) Size: 5.4 x 4.4 x 1.7 cm. This classic and historic New York piece is from the Sterling Iron Mine at Antwerp. Foliated, two-toned gray plates of bladed stilpnomelane are set in matrix. Stilpnomelane is an uncommon layered silicate, and this is a very highly representative, old-time specimen. This old mine closed in 1910. Accompanied by an expertly handwritten, faded label from an older collection. The collection this came out of was a museum stash dating to prior to World War I. Mineral

Stilpnomelane

stilpnomelane

Formula
(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36·nH2O
One single white crystal aggregate of the very rare SiO2 mineral stishovite from the TL In Meteor Crater, Arizona. Ex Vandenbroucke Museum collection from Waregem, Belgium Mineral

Stishovite

stishovite

Formula
SiO2
Micro-nugget ~0.53x0.44x0.15 mm of pure, analytically confirmed by microprobe Stistaite (SnSb) from placer of Edzhei river, Kuraminskie Mts, Chatkal-Kuraminskii Range, NE Uzbekistan. Mineral

Stistaite

stistaite

Formula
SnSb
Dark green almost black microcrystals of the very rare Cu vanadate mineral stoiberite from the TL in El Salvador (Izalco Volcano, Sonsonate Department, El Salvador) and one of only two known localities worldwide. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Stoiberite

stoiberite

Formula
Cu5(VO4)2O2
Stokesite, Albite (Var.: Cleavelandite) Locality: Urucum mine (Tim mine; Córrego do Urucum pegmatite), Galiléia, Doce valley, Minas Gerais, Southeast Region, Brazil (Locality at mindat.org) Size: 3.1 x 2.5 x 2.4 cm. Stokesite is a very rare calcium, tin silicate. A gorgeous little 1.0 cm radial spray of glassy stokesite crystals is beautifully perched atop a cluster of pearlescent, parallel-growth cleavelandite blades. This excellent specimen is from the Corrego do Urucum pegmatite of Brazil and is a very uncommon, gemmy spray of the species. Most Urucum stokesites are spherical, radial aggregates. Older material, from Carlos Barbosa, back in the late 1990s. Mineral

Stokesite

stokesite

Formula
CaSn[Si3O9] * 2H2O
Mineral

Stolperite

stolperite

Formula
AlCu
Stolzite Locality: Broken Hill, Yancowinna County, New South Wales, Australia (Locality at mindat.org) Size: miniature, 3.6 x 3.0 x 2.6 cm Stolzite Translucent, lustrous, caramel colored, stolzite (lead tungstate) crystals, to 3.5 mm across, are perched on a limonitic matrix. Their tetragonal form is evident in the well-developed crystals. Broken Hill is considered one of the top localities for this species. Mineral

Stolzite

stolzite

Formula
PbWO4
Mineral

Stoppaniite

stoppaniite

Formula
Be3Fe³⁺2(Si6O18) * H2O
Mineral

Stornesite-(Y)

stornesite-(Y)

Formula
Na6(Ca5Na3)YMg43(PO4)36
Outstanding dark orange microcrystals of the extremely rare germanium mineral stottite from the type locality in Tsumeb (Tsumeb Mine, Otavi Highlands, Namibia). Stottite has only been found in Tsumeb, so it is a only locality mineral. Labeled as RR in Gebhard book (single occurrence with more than 10 specimens). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Stottite

stottite

Formula
Fe²⁺Ge⁴⁺(OH)6
Mineral

Stracherite

stracherite

Formula
BaCa6(SiO4)2[(PO4)(CO3)]2F
Black massive Straczekite on matrix; from: Union Carbide Mine, Wilson Springs, Garland County, Arkansas, USA. Photo and collection Fernando Brederodes. Mineral

Straczekite

straczekite

Formula
(Ca,K,Ba)V8O20·3H2O
Mineral

Strakhovite

strakhovite

Formula
NaBa3Mn²⁺2Mn³⁺2Si6O19(OH)3
Mineral

Strandite

strandite

Formula
Pb3Mn³⁺4Mn⁴⁺3O15
3.3 x 1.8 x 1.1 cm. Cyan-blue, microcrystalline Stranskiite highlights this specimen. The largest portion of Stranksiite is nearly 8 mm long, and the mineral is actually translucent. Stranskiite is a very rare zinc arsenate and Tsumeb is the Type Locality. For what it is, this Stranksiite miniature is superb.Locality: Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia Mineral

Stranskiite

stranskiite

Formula
Zn2Cu(AsO4)2
Strashimirite Locality: Schwarzleo District, Schwarzleograben, Hütten, Leogang, Saalfelden, Salzburg, Austria Field of view 4 mm. Depth of field is achieved with CombineZM. Specimen and photo Leon Hupperichs. Mineral

Strashimirite

strashimirite

Formula
Cu4(AsO4)2(OH)2·2.5H2O
Yellow green crystals of the new mineral magnesioleydetite (IMA 2017-063) intermixed with also yellow green crystals of the also new mineral strassmannite, (IMA 2017-086). Analyzed specimen, see copy enclosed. Acicular white mineral associated is pickeringite. From: Widowmaker Mine, Fry Mesa, White Canyon, San Juan County, Utah, United States of America. Mineral

Straßmannite

straßmannite
golden-yellow Strelkinite from Lisdan-Siwaga Fault, Hashem region, 70 km southeast of Amman, Jordan, FOV 6mm Mineral

Strelkinite

strelkinite

Formula
Na2(UO2)2(VO4)2·6H2O
Strengite Locality: Leveäniemi Mine, Svappavaara, Kiruna district, Lappland, Sweden (Locality at mindat.org) Pink crystal balls of Strengite. Field of view 10 mm. Specimen and photo Leon Hupperichs. Mineral

Strengite

strengite

Formula
FePO4 * 2H2O
Dark blue microcrystals of stringhamite associated to sky blue acicular crystals of whelanite Mineral

Stringhamite

stringhamite

Formula
CaCu(SiO4) * H2O