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Separate crystals (a,b) and crystal clusters (c,d: small crystals overgrow large crystal) of krasnoshteinite. Blocky crystals of dolomite and distorted quartz crystal are observed in (b). Mineral

Krasnoshteinite

krasnoshteinite

Formula
Al8[B2O4(OH)2](OH)16Cl4*7H2O
Krasnovite Locality: Cerro Sapo, Ayopaya Province, Cochabamba Department, Bolivia (Locality at mindat.org) Picture width 4 mm. Collection and photograph Christian Rewitzer Mineral

Krasnovite

krasnovite

Formula
Ba(Al,Mg)(PO4,CO3)(OH)2 * H2O
Mineral

Kratochvílite

kratochvílite

Formula
C13H10
Mineral

Krausite

krausite

Formula
KFe(SO4)2 * H2O
Mineral

Krauskopfite

krauskopfite

Formula
BaSi2O5 * 3H2O
Krautite, Villyaellenite Field of view: 3 mm Locality: Săcărâmb, Certeju de Sus, Hunedoara County, Romania Description: Pink krautite with tan villyaellenite. Modified by CombineZP, stacking 11 images. Specimen was purchased in Tucson in February 2016 from Jaroslav Hyrsl. Locality was formerly known as Nagyag. This is the type locality for krautite. The entire specimen is shown in a daughter photograph, and the labels are also shown in a daughter photograph. Mineral

Krautite

krautite

Formula
Mn(AsO3OH)·H2O
Mineral

Kravtsovite

kravtsovite

Formula
PdAg2S
Mineral

Kreiterite

kreiterite

Formula
CsLi2Fe³⁺(Si4O10)F2
:Locality: Kopeisk, Chelyabinsk Oblast', Urals Region, Russian Federation Size: 0.8 × 0.6 × 0.6 cm Description: Kremersite is a very rare complex halide, very deliquescent, that is why it is protected sealed in a glass capsule. Visible crystals, transparent and with an intense red color. From the coal mine Nr. 50 of this Russian locality known for more than 40 new species formed on spontaneous burning coal dumps and are known to rage for many years or decades, forming many rare high-temperature minerals. Mineral

Kremersite

kremersite

Formula
(NH4)2Fe³⁺Cl5·H2O
Krennerite Locality: Cresson Mine, Eclipse Gulch, Cripple Creek District, Teller County, Colorado, USA (Locality at mindat.org) Size: 3.0 x 2.7 x 2.5 cm. This rare gold silver telluride forms in some of the finest crystals in the world in the Cripple Creek Mining District. Fine crystals of Krennerite on matrix are virtually impossible to obtain anymore as the mines around Cripple Creek have long been defunct. This specimen features a few sharp, lustrous, platy, silvery colored crystals of Krennerite on Quartz matrix. These specimens are virtually impossible to obtain on the market these days. Mineral

Krennerite

krennerite

Formula
Au3AgTe8
Mineral

Krettnichite

krettnichite

Formula
PbMn³⁺2(VO4)2(OH)2
White crystal aggregate of the very rare Al sulphate-phosphate mineral kribergite from the type (Kristineberg Mine, Malå, Västerbotten County, Sweden) and only known locality worlwide in Sweden. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Kribergite

kribergite

Formula
Al5(PO4)3(SO4)(OH)4 * 4H2O
Krieselite, from Tsumeb, Namibia Mineral

Krieselite

krieselite

Formula
Al2(GeO4)F2
Very dark green single crystal of the extremely rare Na-Mg-Cr silicate from the type locality in Canyon Diablo meteorite (Canyon Diablo Meteorite, Meteor Crater, Coconino County, Arizona, United States of America). Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Krinovite

krinovite

Formula
Na2Mg4Cr³⁺2(Si6O18)O2
Mineral

Kristekite

kristekite

Formula
Cu2(H2O)4(UO2)(SeO3)3·4H2O
A 1 mm group of white crystals on orthoclase self collected june 2006 Mineral

Kristiansenite

kristiansenite

Formula
Ca2ScSn(Si2O7)(Si2O6OH)
White globules of kristjánite on the surface of a blade of belomarinaite, specimen 24468. The width of the photograph is 1 mm. Mineral

Kristjánite

kristjánite

Formula
KNa2H(SO4)2
Mineral

Krivovichevite

krivovichevite

Formula
Pb3Al(OH)6SO4(OH)
Mohs
3
Mineral

Krotite

krotite

Formula
CaAl2O4
Mohs
6.5
Mineral

Kroupaite

kroupaite

Formula
KPb0.5[(UO2)8O4(OH)10]*10H2O
Kruijenite (Image width: 1.5 mm) Locality: Feuerberg, Hohenfels-Essingen, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany Description: Kruijenite in typical yellow/greenish crystals. Kruijenite is accepted by IMA sept. 2018-057 Mineral

Kruijenite

kruijenite

Formula
Ca4Al4(SO4)F2(OH)16*2H2O
Mohs
3
Mineral

Krupičkaite

krupičkaite
Sharp outstanding prismatic and acicular crystals of the rare sulphide krupkaite fom the type locality: Barbora Adit, Krupka, Usti Region, Bohemia, Czech Republic. Mineral

Krupkaite

krupkaite

Formula
PbCuBi3S6
Mohs
4
Krut'aite Locality: El Dragón mine, Antonio Quijarro Province, Potosí Department, Bolivia (Locality at mindat.org) Picture width 2.5 mm. Collection and photograph Christian Rewitzer Mineral

Krut'aite

krut'aite

Formula
CuSe2
Mohs
4