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Minerals

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Metallic inclusions of the very rare Fe-Ni antimonide seinajokite from the TL in Seinajoki, Finland. One side of the specimen is polished because of the analysis. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Seinäjokite

seinäjokite
Mineral

Sejkoraite-(Y)

sejkoraite-(Y)

Formula
Y2[(UO2)8O6(SO4)4(OH)2]·26H2O
Needles of ferro-gedrite on cleavage plane (001) of sekaninaite. Ferrogedrite is a product of weathering and decay of sekaninaite. From: Dolní Bory, Křižanov, Žďár nad Sázavou, Vysočina Region, Czech Republic. Mineral

Sekaninaite

sekaninaite

Formula
(Fe,Mg)2Al3(AlSi5O18)
Selenium Locality: Lichtenberg Absetzer dump, Ronneburg U deposit, Thuringia, Germany Field of view 5 mm. Photo and specimen Leon Hupperichs. Mineral

Selenium

selenium

Formula
Se
Figure 1. (a) Reflected light image of selenodantopaite from Potůčky (white) associated with chalcopyrite (yellow) and minor pyrite (light yellow) in quartz gangue with abundant strongly coffinitized uraninite. (b) Back-scattered electron image of the same area, selenodantopaite is white, coffinitized uraninite grey. Holotype sample (catalogue number P1P 22/2023). Mineral

Selenodantopaite

selenodantopaite

Formula
Ag5Bi13Se22
Mineral

Selenojalpaite

selenojalpaite

Formula
Ag3CuSe2
Mineral

Selenojunoite

selenojunoite

Formula
Cu2Pb3Bi8Se16
Mineral

Selenolaurite

selenolaurite
Mineral

Selenopolybasite

selenopolybasite

Formula
Cu(Ag,Cu)6Ag9Sb2(S,Se)9Se2
Mineral

Selenostephanite

selenostephanite

Formula
Ag5SbSe4
Seligmannite, Galena, Quartz Dimensions: 74 mm x 51 mm x 27 mm Locality: Palomo Mine, Castrovirreyna Province, Huancavelica, Peru Original description: A mass of Quartz crystals with some Galena crystals covered with small crystals of Seligmannite. JSS specimen and photo. Mineral

Seligmannite

seligmannite

Formula
CuPbAsS3
Mineral

Selivanovaite

selivanovaite

Formula
(Na,Ca)3(Ti,Fe)5[Si4O18(OH)3]*7H2O
Sellaite, Quartz Dimensions: 18 mm × 8 mm Locality: Maine Mine, Cordesse, Lucenay-l'Evêque, Autun, Saône-et-Loire, Bourgogne-Franche-Comté, France Description: Sellaite crystallized in small needles on Quartz. Personally collected: August 02, 2020. Mineral

Sellaite

sellaite

Formula
MgF2
Mineral

Selsurtite

selsurtite
Mineral

Selwynite

selwynite

Formula
NaKBeZr2(PO4)4·2H2O
Semenovite-(Ce) is a very rare, Be and Ce bearing silicate mineral from the type locality in Greenland (Taseq, Ilímaussaq Complex, Kujalleq, Greenland). It forms sharp orange-brown crystals in matrix in association with colourless epididymite. Very sought after species from Greenland. Mineral

Semenovite-(Ce)

semenovite-(Ce)

Formula
Na8Ca2FeBe6Ce2Si14O40(OH)4F4
Semseyite Locality: Herja Mine (Kisbánya), Baia Mare (Nagybánya), Maramures County, Romania (Locality at mindat.org) Size: 3 x 2.3 x 2.2 cm. A fine cluster of radial Semseyite crystals with superb metallic luster and brightness. The main cluster of well-terminated and bladed 1.4 cm crystals all line up in an undulating fan that looks somewhere between a crown and the fan of a peacock's tail. This is the type locality for the species, in 1881. Ex. Charlie Key stock. Mineral

Semseyite

semseyite

Formula
Pb9Sb8S21
Senaite Locality: Oberaar lake area, Grimsel area, Hasli Valley, Bern, Switzerland (Locality at mindat.org) Size: miniature, 4.7 x 3.4 x 2.6 cm Senaite A robust 4mm crystal of this very, VERY rare lead-titanium-iron-manganese oxide. The crystal is sharp and 3-dimensional, showing all side faces. Old Siber & Siber label. Mineral

Senaite

senaite

Formula
Pb(Mn,Y,U)(Fe,Zn)2(Ti,Fe,Cr,V)18(O,OH)38
Andorite VI Locality: San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia (Locality at mindat.org) Size: 3.8 x 3.8 x 1.5 cm. From the new find in November 2004. Andorite is lead, silver, antimony sulfosalt and was named for the Hungarian mineral collector Andor von Semsey (1833-1923), who holds a remarkable distinction for having two mineral species named after him (andorite and semseyite). This mine at Oruro dates Spanish mining as far back as the year 1595 and was mined by Incan Indians for several centuries prior. In all the years of mining, these are undoubtedly, the worlds finest Andorites extant! These specimens were extracted from the same vein system worked by the father of Bolivian mineralogy, Federico Ahlfeld. Ahlfeld worked the San Jose mine and Itos mine (the other significant andorite locality at the same mountain in Oruro) when the mines were used predominantly as a major sources of tin to the United States during WWII. The best examples of the species have come from Bolivia. The piece is a "classic", lustrous, steel-grey, multi-layered crystal group of good size and quality. The specimen is associated with minor prismatic Zinkenite crystals. It is a very aesthetic and showy specimen, and is in good condition for this material, with only one spots on the bottom where it detached from the pocket wall, and is not fresh damage, but happened long ago underground. It displays amazingly well from one side showing virtually no damage. It is very difficult to find any samples of this mineral on the market today, and until very recently, the locality had not produced specimens in MANY years. Mineral

Senandorite

senandorite

Formula
AgPbSb3S6
Sénarmontite Locality: Djebel Haminate Mine, Ain Beida, Constantine Province, Algeria (Locality at mindat.org) Size: 5.5 x 3.3 x 1.8 cm. Senarmontite is an uncommon antimony oxide and this excellent, rich specimen is from the Type Locality in Algeria - the Djebel Haminate Mine. Sharp, waxy lustre, translucent, gray senarmontite octahedrons to 6 mm cover all three sides of the 3-dimensional massive senarmontite matrix. This is a rare species, and these old specimens were found by the old French exploration service BRGM, prior to the 1950s and even as far back as the 1850s. Odds are that this was one of the specimens found on one of those French expeditions. You seldom see any examples of this species in crystalline form except from this locality, and from here usually just thumbnail loose crystals. This is a remarkable, large, matrix specimen. Ex. John Ydren Collection. Mineral

Senarmontite

senarmontite

Formula
Sb2O3
Senegalite Locality: Mount Kourou Diakouma (Kouroudiako), Saraya, Falémé River basin, Tambacounda Region, Senegal (Locality at mindat.org) Size: 8.1 x 6.3 x 4.2 cm. A beautiful crystalline carpet of senegalite lines pockets of turquoise, on this classic specimen form the type locality. Mineral

Senegalite

senegalite

Formula
Al2(PO4)(OH)(OH)2 * H2O
Sengierite Locality: Luiswishi Mine, Lubumbashi (Elizabethville), Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre) Field of view 4 mm. Mineral

Sengierite

sengierite

Formula
Cu2(UO2)2(VO4)2(OH)2·6H2O
Mineral

Senkevichite

senkevichite

Formula
CsKNaCa2Ti[O|Si7O18(OH)]
sepiyolit Mineral

Sepiolite

sepiolite

Formula
Mg4Si6O15(OH)2·6H2O