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Minerals

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White rounded crystal aggregates of the very rare Mg borate mineral hungchaoite from one of the only three known localities worldwide: Black Hills, Lawrence County, South Dakota, United States of America. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Hungchaoite

hungchaoite

Formula
Mg(B4O7) * 9H2O
Mineral

Huntingdonite

huntingdonite

Formula
Pb19Sb16As6S51Cl2
Huntite nodules. Turó de Montcada quarry, Montcada y Reixac, Barcelona, Spain Mineral

Huntite

huntite

Formula
CaMg3(CO3)4
Hureaulite, Reddingite Locality: Cigana claim (Jocão claim), Galiléia, Doce valley, Minas Gerais, Southeast Region, Brazil (Locality at mindat.org) Size: 5.9 x 4.9 x 3.9 cm. This pegmatite is known for its suite of high-quality phosphate species, more than for gem crystals. It is very similar, in fact, to the famous Tip Top Mine in South Dakota for the major phosphate species found. However, hureaulite from this locality has a more beautiful, intense rich color and lustre, and is arranged in such pretty aggregates against contrasting lustrous brown reddingite, that I consider these to be among the more beautiful examples of the species. Usually you find the hureaulite dispersed as a flat carpet of small 2-5mm crystals on matrix shards. Few specimens have relief and well-defined aesthetics: but this piece has a sharp, superb cluster approximately 3 cm tall perched atop the specimen. It is 3-dimensional and leaps out. Mineral

Hureaulite

hureaulite

Formula
Mn²⁺5(PO3OH)2(PO4)2·4H2O
Mohs
3.5
Mineral

Hurlbutite

hurlbutite

Formula
CaBe2P2O8
Mineral

Hutcheonite

hutcheonite

Formula
Ca3Ti2(SiAl2)O12
Hutchinsonite Locality: Quiruvilca Mine (La Libertad Mine; ASARCO Mine), Quiruvilca District, Santiago de Chuco Province, La Libertad Department, Peru (Locality at mindat.org) Size: 4.5 x 4.4 x 2.2 cm. This is one of the richest examples of the species out there. It is by far the richest piece I have seen for this rare thallium-rich sulfosalt. Not the biggest, but the most richly crystallized. It is composed of extremely robust, diverging sprays of acicular hutchinsonite crystals, many doubly terminated. The crystals, to .75 cm across, are lustrous, dark gray, and nearly cover the host matrix. This is an amazing specimen of the rare lead, thallium, sulpharsenide. From the collection of my mentor, Carlton Davis. Acquired in the early 1980s from dealer Gary Hansen. Mineral

Hutchinsonite

hutchinsonite

Formula
TlPbAs5S9
Huttonite (Field of view: 3.0 mm) Locality: Laacher See Volcanic Complex, Volcanic Eifel, Rhineland-Palatinate, Germany Description: Huttonite crystal from the Laacher See volcanic complex. Collection: Karl Leu. Photo: Fred Kruijen Mineral

Huttonite

huttonite

Formula
ThSiO4
Mohs
4.5
Outstanding vitreous colorless crystals of the very rare mineral hyalotekite from one of the only 3 known localities worldwide: Artillery Peak, Artillery Mountains, Mohave County, Arizona, United States of America. Associated to minoritary blue kinoite. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Hyalotekite

hyalotekite

Formula
(Pb,Ba,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)
Mineral

Hyblerite

hyblerite

Formula
Pb4Bi2(SO4)2(CO3)O4
Astrophyllite Locality: Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia (Locality at mindat.org) Size: 6.9 x 6.2 x 1.9 cm. A particularly fine specimen from this important locality with thick, metallic-foil-like, flat-laying crystals to 3 cm embedded in matrix. Ex. Martin Zinn Collection. Mineral

Hydroastrophyllite

hydroastrophyllite
Mineral

Hydrobasaluminite

hydrobasaluminite

Formula
Al4(SO4)(OH)10 * 12-36H2O
Mineral

Hydrobiotite

hydrobiotite

Formula
K(Mg,Fe²⁺)6((Si,Al)8O20)(OH)4 * nH2O
Hydroboracite Locality: Death Valley, Inyo County, California, USA (Locality at mindat.org) Size: 4.7 x 3.8 x 3.0 cm. Hydroboracite is a rare hydrated borate. This is a very fine specimen of diverging sprays of large, waxy lustre, blades nicely set in matrix. I like the way the largest spray is front and center, in the most prominent position. Old material from Death Valley. Rarely crystallized in such quality as you see here. Mineral

Hydroboracite

hydroboracite

Formula
CaMg[B3O4(OH)3]2·3H2O
Brown crystals of the rare mineral hydrocalumite on a contrasting matrix. From: Kopeisk, Chelyabinsk Oblast', Urals Region, Russian Federation. Mineral

Hydrocalumite

hydrocalumite

Formula
Ca4Al2(OH)12(Cl,CO3,OH)2 * 4H2O
Hydrocerussite Locality: Passa Limani Cove slag locality, Passa Limani area, Lavrion District slag localities, Lavrion (Laurion; Laurium) District, Attikí (Attica; Attika) Prefecture, Greece Picture width 2 mm. Collection and photograph Christian Rewitzer Mineral

Hydrocerussite

hydrocerussite

Formula
Pb3(CO3)2(OH)2
Mineral

Hydrochlorborite

hydrochlorborite

Formula
Ca4B8O15Cl2 * 21H2O
Mineral

Hydrodelhayelite

hydrodelhayelite

Formula
KCa2(Si7Al)O17(OH)2·6H2O
This is a thumbnail size specimen 30 mm tall, Hydrodresserite is much rarer than Dresserite Mineral

Hydrodresserite

hydrodresserite

Formula
BaAl2(CO3)2(OH)4 * 3H2O
Mineral

Hydroglauberite

hydroglauberite

Formula
Na10Ca3(SO4)8 * 6H2O
Microphotographs of aqueous fluid inclusions. (e) Phase transitions in a pseudosecondary AL+V inclusion in sphalerite from the sample Pb-668 during cryometry. Hh—hydrohalite, Cla—clathrate. Mineral

Hydrohalite

hydrohalite

Formula
NaCl·2H2O
Mineraly.sk - halloyzit Mineral

Hydrohalloysite

hydrohalloysite

Formula
Al2Si2O5(OH)4·2H2O
Outstanding green sharp isolated hydrohonessite crystal on millerite from this Italian locality (Groppallo, Piacenza Province, Emilia Romagna, Italy) in a contrasting matrix. Originally described as jamborite, now most green coatings on millerite like this have been shown to be hydrohonessite. Mineral

Hydrohonessite

hydrohonessite

Formula
(Ni1-xFe³⁺x)(OH)2(SO4)x/2 * nH2O
Hydrokenoelsmoreite, Stolzite Seagraves Mine (Lone Star Mine; Silver King Prospect; Star Mine; Grey Eagle Mine), Seafoam District, Custer Co., Idaho, USA Locality: Seagraves Mine (Lone Star Mine; Silver King Prospect; Star Mine; Grey Eagle Mine), Seafoam District, Custer County, Idaho, USA (Locality at mindat.org) Size: 6.5 x 6.0 x 4.5 cm. White stolzite grains accent rich yellow veins of Hydrokenoelsmoreite (formerly known as ferritungstite) crystals (micros, but visible with a loupe) on this rare locality piece. Old material from the Pasco, Washington collection of Andrew Micklancic. Mineral

Hydrokenoelsmoreite

hydrokenoelsmoreite

Formula
☐2W2O6(H2O)
Mohs
3