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Krutovite Dimensions: 5.6 x 4.9 x 3.2 cm Locality: Svornost Mine (Einigkeit Mine), Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic Description: A wonderful piece of the very rare nickel arsenide krutovite, which is only found in less than a dozen localities in the world. The type locality for the species is Potucky, which is right next to Svornost in the Jachymov District in Bohemia. Pale grey krutovite can be seen on a few sides of the specimen, the light yellow mineral is unidentified, though it could just be dickite clay. Mineral

Krutovite

krutovite

Formula
NiAs2
Mohs
5.5
Mineral

Kryachkoite

kryachkoite

Formula
(Al,Cu)6(Fe,Cu)
Mineral

Kryzaite

kryzaite

Formula
Na4(MgCr)(PO4)3
Kryzhanovskite Locality: Rapid Creek, Dawson Mining District, Yukon Territory, Canada (Locality at mindat.org) Size: thumbnail, Kryzhanovskite Excellent representative specimen with several sharp xls on contrasting matrix. Some large crystals are damaged but they are huge. there are a few sharp, intact, smaller crystals of 2-3 mm Mineral

Kryzhanovskite

kryzhanovskite

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

Králíkite

králíkite

Formula
BaCl2·2H2O
Tiny pearly white crystals of krasnoite on brown triplite. Ex Jaroslav Hyrsl specimen. Field of view 3 mm. From: Huber stock, Krásno, Horní Slavkov, Sokolov District, Karlovy Vary Region, Czech Republic. Mineral

Krásnoite

krásnoite

Formula
Ca3Al7.7Si3P4O22.9(OH)13.3F2·8H2O
Kröhnkite Locality: Chuquicamata Mine, Chuquicamata District, Calama, El Loa Province, Antofagasta Region, Chile (Locality at mindat.org) A very rare and exceptional specimen with elongated, translucent crystals to 4 cm. This is a superior specimen of a quality I have not seen for sale before. Krohnkite is extremely fragile and large crystallized specimens, as opposed to massive specimens, are almost impossible to get. The pics say it all 5.4 x 3.6 x 2.4 cm Mineral

Kröhnkite

kröhnkite

Formula
Na2Cu(SO4)2·2H2O
Mineral

Krügerite

krügerite
Ktenasite Locality: Maria Josefa Mine, Rodalquilar, Níjar, Almería, Andalusia, Spain Picture width 1 mm. Collection and photograph Christian Rewitzer. (Microprobed specimen) Mineral

Ktenasite

ktenasite

Formula
(Cu,Zn)5(SO4)2(OH)6·6H2O
Mineral

Kuannersuite-(Ce)

kuannersuite-(Ce)

Formula
NaCeBa3(PO4)3F0.5Cl0.5
Kudriavite. Field of view 4 mm. From: Mutnovsky volcano, Kamchatka Krai, Russia. Mineral

Kudriavite

kudriavite

Formula
(Cd,Pb)Bi2S4
Mineral

Kudryavtsevaite

kudryavtsevaite

Formula
Na3MgFe³⁺Ti4O12
Mineral

Kufahrite

kufahrite

Formula
PtPb
Kukharenkoite-(Ce) Locality: Demix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada Description: Individual blades to ~ ½ mm; top to bottom ~⅞ mm. Thanks to Bob Rothenberg. MOB coll. This is an example of kukharenkoite from the main sill. Mineral

Kukharenkoite-(Ce)

kukharenkoite-(Ce)

Formula
Ba2Ce(CO3)3F
Mineral

Kukharenkoite-(La)

kukharenkoite-(La)

Formula
Ba2(La,Ce,Th)(CO3)3F
Outstanding sharp white prismatic kukisvumite crystals from the type and only known locality worldwide in Kukisvumur (Kukisvumchorr Mountains, Khibiny Massif, Murmansk Oblast, Russian Federation), and associated to lamprophyllite. Kukisvumite crystals in this quality (photo 1) are very rarely seen in the mineral market. Ex Vandenbroucke Museum collection from Waregem, Belgium Mineral

Kukisvumite

kukisvumite

Formula
Na6ZnTi4(Si8O24)O4 * 4H2O
Mineral

Kuksite

kuksite

Formula
Pb3Zn3(PO4)2(TeO6)
Kulanite, Apatite-(CaF), Siderite Locality: Big Fish River, Dawson Mining District, Yukon Territory, Canada (Locality at mindat.org) Size: 5.2 x 3.4 x 1.2 cm. The dominant mineral is fluorapatite in glassy, colorless crystals, to 0.7 cm across. Golden amber crystals of siderite are also evident in crystals .2 cm in length. Blackish green crystals of kulanite, a barium, iron, manganese, magnesium, aluminum phosphate, to .5 cm across are also present. There may also be micro crystals of brazilianite present. Ex. Martin Zinn Collection. Mineral

Kulanite

kulanite

Formula
Ba(Fe²⁺,Mn²⁺,Mg)2(Al,Fe³⁺)2(PO4)3(OH)3
Mineral

Kuliginite

kuliginite

Formula
Fe3Mg(OH)6Cl2
Pinkish crystals of kuliokite-(Y) in association with albite (white), amazonite (green), and aegirine (black) from the Ploskaya Mt, Kola peninsula, Russian Arctic. The field of view is ca. 2 × 3 mm2. Mineral

Kuliokite-(Y)

kuliokite-(Y)

Formula
Y4Al(SiO4)2(OH)2F5
Colorless pearly crystal aggregates of the very rare mineral kulkeite from the TL in Algeria (El Mourdur Hill, Derrag, Tell Atlas, Aïn Defla Province, Algeria). The specimen is partially polished because it was analyzed. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Kulkeite

kulkeite

Formula
Mg8Al(AlSi7O20)(OH)10
Mineral

Kullerudite

kullerudite

Formula
NiSe2
Mineral

Kumdykolite

kumdykolite

Formula
Na(AlSi3O8)
Outstanding orange crystals of the new and extremely rare phosphate mineral kummerite (IMA 2015-036), associated to dark green beraunite needles. SEM/EDS and DRX analyzed. Only one known locality worldwide! From: Hagendorf, Oberpfalz, Bavaria, Germany. Mineral

Kummerite

kummerite

Formula
Mn²⁺Fe³⁺Al(PO4)2(OH)2·8H2O