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Gift from Tony Steede – thanks Tony!. Analyzed find. MOB coll. Stereo pair. Judging from the scarcity of Mindat posts for this mineral, it appears to be very rare. Hence, even though this photo isn’t very good - it barely works even in stereo – it may be worth posting. This is the best I can do with my set-up. The xls are just very tiny. To the naked eye (through the scope), the xls appear prismatic and hexagonal. That may seem surprising for a serpentine group mineral, but Tony Steede did EDS and Malcolm Back did XRD confirming kellyite. (This find is described in a copy of a page from a CMMA Micronews Bulletin which I have dated as March 2006. However, there is no date on the article itself and I am unable to find the actual bulletin.) The xls appear to be not quite colorless – but more yellowish than the brownish shade in the photo. (At this magnification, I get a great deal of chromatic aberration and have to resort to brute force to get rid of it. That’s not always possible without affecting the color of the material of interest.) The very small size of the specimen precludes determination of the environment. The only other recognizable mineral is natrolite. Tony mentions sphalerite, aegirine and ancylite. Modified by CombineZP. Mineral

Kellyite

kellyite

Formula
Mn²⁺2Al(AlSiO5)(OH)4
Brownish black inclusions of the extremely rare Hg-Br mineral kelyanite from the type locality in Kelyana Hg deposit (Kelyana Hg deposit, Middle Kelyana River, Baunt District, Buryatia, Russian Federation) included in a polished probe amount that was used to analyse it. Analyzed by the former owner of the specimen, the Vandenbroucke Museum collection, from Waregem, Belgium. Mineral

Kelyanite

kelyanite

Formula
(Hg+2)6Sb³⁺BrCl2O6
A very big number of very small pieces of the very rare mineral Sr-Al arsenate mineral kemmlitzite from the TL in Kemmlitz, Germany. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Kemmlitzite

kemmlitzite

Formula
SrAl3(AsO4)(SO4)(OH)6
Mohs
5.5
A metallic nugget of the extremely rare mineral kempite in an analyzed specimen by SEM/EDS by the former owner of the specimen (The Vandenbrouke Museum). From: Oktyabrsky Mine, Talnakh, Noril'sk, Putoran Plateau, Taimyr Peninsula, Krasnoyarsk Krai, Russian Federation. The sample is included in the epoxy resin used for the analysis. Ex Vandenbroucke Museum collection from Waregem, Belgium. No duplicates available. Mineral

Kempite

kempite

Formula
Mn²⁺2Cl(OH)3
Extremely rare mercury mineral (Hg3S2Cl2) known from only two localities worldwide, being this Spanish locality (Oriental Mine, Chóvar, Valencian Community, Spain) the best by far, in size and quality of the crystals. Kenshuite is present as pinkish yellow acicular crystals of prismatic habit associated to massive cinnabar and malachite. See an excellent article on the locality in Mineral Up 2007/1 p.46-49. Mineral

Kenhsuite

kenhsuite

Formula
Hg²⁺3S2Cl2
Mineral

Kenngottite

kenngottite

Formula
Mn²⁺3Fe³⁺4(PO4)4(OH)6(H2O)2
Mineral

Kennygayite

kennygayite
Mineral

Kenoargentotennantite-(Fe)

kenoargentotennantite-(Fe)
Reflected-light photomicrographs of the polished sections which showing occurrences and mineral associations of kenoargentotetrahedrite-(Fe) (Kattr). (a) The greenish-grey grains of kenoargentotetrahedrite-(Fe) (Kattr) in plane-polarized light. (b) Anhedral grains of kenoargentotetrahedrite-(Fe) (Kattr) associated with galena (Gn), sphalerite (Sp) and chalcopyrite (Ccp) in quartz (Qz) and minor pyrosmalite-(Mn) (Pys) and fluorite (Flr). 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

Kenoargentotetrahedrite-(Fe)

kenoargentotetrahedrite-(Fe)

Formula
Ag6(Cu4Fe2)Sb4S12☐
(a) Plane-polarized reflected-light images and (b–d) backscattered electron (BSE) images of kenoargentotetrahedrite-(Zn) and associated mineral assemblage. Kattr-Zn: kenoargentotetrahedrite-(Zn), Kattr-Fe: kenoargentotetrahedrite-(Fe), Ttr-Zn: tetrahedrite-(Zn), Sp: sphalerite, Gn: galena, Ccp: chalcopyrite, Py: pyrite, and Qz: quartz. Mineral symbols are quoted from Warr (2021). 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

Kenoargentotetrahedrite-(Zn)

kenoargentotetrahedrite-(Zn)

Formula
[Ag6]⁴⁺(Cu4Zn2)Sb4S12◻
Back-scattered electron image of the kenomicrolite fragment investigated. The fragment is irregularly shaped and has been isolated in the sample with no other minerals present. It has a medium bright grey appearence with cracks but no other features. The fragment in the image is approximately 160 by 120 micrometres. The energy level was 15.0 kV. Mineral

Kenomicrolite

kenomicrolite

Formula
◻2Ta2[O4(OH)2]◻
Mineral

Kenoplumbomicrolite

kenoplumbomicrolite

Formula
(Pb,☐)2Ta2O6(☐,OH,O)
Mineral

Kenorozhdestvenskayaite-(Fe)

kenorozhdestvenskayaite-(Fe)
Mineral

Kenotobermorite

kenotobermorite

Formula
Ca4Si6O15(OH)2(H2O)2·3H2O
White terskite associated to brown kentbrooksite from a pegmatite in Russia (Yubileinaya Pegmatite, Lovozero Massif, Kola, Russian Federation). Mineral

Kentbrooksite

kentbrooksite

Formula
(Na,REE)15(Ca,REE)6(Mn²⁺,Fe²⁺)3Zr3Nb[Si25O74]F2 * 2H2O
Kentrolite Locality: Norrbotten working, Långban, Filipstad, Värmland, Sweden (Locality at mindat.org) Size: miniature, 3.4 x 2.4 x 1.2 cm Kentrolite on Braunite A specimen of massive braunite reich with sparkling microcrystalline kentrolite all over it - I am told this is a pretty good specimen for the price and richness, but they are micros and its black on black so its not the prettiest piece, I admit. Mineral

Kentrolite

kentrolite

Formula
Pb2Mn³⁺2(Si2O7)O2
0.4 x 0.4 x 0.4 cm. A small capsule with grains of the rare hydrated sodium silicate species, kenyaite. Type locale (Lake Magadi, Kajiado County, Kenya). Ex. Ralph E. Merrill Collection. Mineral

Kenyaite

kenyaite

Formula
Na2Si22O41(OH)8 * 6H2O
Mineral

Keplerite

keplerite
Mineral

Kerimasite

kerimasite

Formula
Ca3Zr2(SiFe³⁺2)O12
Mohs
7
Kermesite, Calcite Locality: Pezinok, Malé Karpaty Mts, Bratislava Region, Slovakia (Locality at mindat.org) Size: 5.9 x 5.7 x 2.6 cm. A fine specimen of radiating sprays of flat-lying, highly lustrous, acicular, deep wine-red kermesite crystals on calcite-covered massive sulfide matrix from a classic locale - Pezinok, Slovakia. The crystals reach 2.3 cm on this piece, making for excellent material for the species and locality. Color is obvious without need for fancy lighting, and the contrasting matrix is most unusual. This is a very attractive piece with large crystals for the locale...and rare on the market today, as well. Mineral

Kermesite

kermesite

Formula
Sb2OS2
Kernite Locality: U.S. Borax and Chemical Corporation, Boron, California Original description: Kernite. Collected by Kenneth C. Bullock, May, 1981, from U.S. Borax and Chemical Corporation, Boron, California. Mineral collection of Brigham Young University Department of Geology, Provo, Utah. Photograph by Andrew Silver. BYU index 8-1002b, Na2B4O7 x 4H2O. Mineral

Kernite

kernite

Formula
Na2B4O6(OH)2·3H2O
Mineral

Kernowite

kernowite
The kesebolite-(Ce) (Kbl) type specimen with calcite (white) and rhodonite (reddish), GEO-NRM No. 20100343. Field of view is ca. 5 × 3 mm. Photo: Torbjörn Lorin. 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

Kesebolite-(Ce)

kesebolite-(Ce)
Almost white crystal aggregates of the rare mineral kettnerite associated to an unknown green mineral. From Three Musketeers Mine, Ellsworth, La Paz County, Arizona, United States of America. Mineral

Kettnerite

kettnerite

Formula
CaBiCO3OF