Skip to content
Mineralati

Minerals

6323 results

Outstanding tan and yellowish crystal aggregates of the very rare Sr-Ti silicate mineral ohmilite from the TL in Japan (Ohmi River, Ōmi, Itoigawa City, Niigata Prefecture, Honshu Island, Japan). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Ohmilite

ohmilite

Formula
Sr3(Ti,Fe³⁺)(Si2O6)2(O,OH)·2H2O
Mineral

Ohtaniite

ohtaniite

Formula
Mg3(Si0,5◻0,5)Si2O8
Ojuelaite Locality: Christiana Mine, Kamariza Mines (Kamareza Mines), Agios Konstantinos [St Constantine] (Kamariza), Lavrion District Mines, Lavrion (Laurion; Laurium) District, Attikí (Attica; Attika) Prefecture, Greece (Locality at mindat.org) Green Ojuelaite from the Christiana Mine, Kamareza Mines, Lavrion, Greece. Field of view 4 mm. SEM-EDX analysis by S.Möckel. Specimen and photo Leon Hupperichs. Mineral

Ojuelaite

ojuelaite

Formula
ZnFe³⁺2(AsO4)2(OH)2·4H2O
Mohs
3
Outstanding orange brown crystals of the extremely rare rare-earth borofluorosilicate mineral okanoganite-(Y) from the type locality: Washington Pass, Okanogan County, Washington, United States of America. Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Okanoganite-(Y)

okanoganite-(Y)

Formula
(Na,Ca)3(Y,Ce)12Si6B2O27F14
Mineral

Okayamalite

okayamalite

Formula
Ca2B(BSiO7)
Okenite Locality : Khandivali, Maharashtra, India size view 14cm Mineral

Okenite

okenite

Formula
Ca10Si18O46·18H2O
Brownish crystal aggregates of thevery rare Ca-Mn silicate mineral okhotskite from the TL in Japan (Kokuriki Mine, Kitami City, Okhotsk Subprefecture, Hokkaidō Prefecture, Hokkaido Island, Japan). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Okhotskite

okhotskite

Formula
Ca2Mn²⁺Mn³⁺2(Si2O7)(SiO4)(OH)2·H2O
Mineral

Okieite

okieite

Formula
Mg3[V10O28]·28H2O
Mineral

Okruginite

okruginite

Formula
Cu2SnSe3
Mineral

Okruschite

okruschite

Formula
Ca2Mn²⁺5Be4(AsO4)6(OH)4·6H2O
Mohs
3.5
Colour
white
Oldhamite Locality: Lichtenberg Absetzer Mine (dump), Ronneburg U deposit, Gera, Thuringia, Germany Dark grey grains, masses and tiny veins of oldhamite in calcite. Ex Fritz Rüger collection. Field of view 1.5 cm. Mineral

Oldhamite

oldhamite

Formula
CaS
Mohs
4
Mineral

Oldsite-(K)

oldsite-(K)

Formula
K2Fe²⁺[(UO2)(SO4)2]2(H2O)8
Mineral

Olekminskite

olekminskite

Formula
Sr(Sr,Ca,Ba)(CO3)2
Mohs
3
Pink crystal fragment of the rare mineral olenite from Karelia Republic, Russian Federation. Mineral

Olenite

olenite

Formula
Na(Al3)Al6(Si6O18)(BO3)3O3(OH)
Mohs
7
Mineral

Olgafrankite

olgafrankite

Formula
Ni3Ge
Very dark green crystals of the rare phosphate mineral olgite from the type locality in Kola (Karnasurt Mountain, Lovozero Massif, Murmansk Oblast, Russian Federation). Ex.Dr.Hartel collection. Mineral

Olgite

olgite

Formula
Na(Na,Sr)2Ba(PO4)2
Olivenite Locality: Maria Josefa Mine, Rodalquilar, Níjar, Almería, Andalusia, Spain Picture width 2 mm. Collection and photograph Christian Rewitzer Mineral

Olivenite

olivenite

Formula
Cu2(AsO4)(OH)
Mohs
3
This green olivine meteorite from the mantle of an alien world might be the closest we’ll come to holding one. While its isotope ratios are unique to its patent body (the asteroid Vesta; more on that below), the minerals of its mantle and molten metal core are believed to be very similar to Earth. On Earth, uplifted mantle tends to be ancient and heavily weathered. The olivines gelatinize in weak acids and offer little resistance to attack by weathering agents or hot hydrothermal flows. The greenish magnesium leaches out from hydration, oxidation, and carbonation. For 60 years researchers have tried to drill to the Earth’s mantle to get a pristine sample. The Soviets still hold the record for the deepest drill in 1979 (the Kola Superdeep Borehole goes down 7.6 miles), but they only got through 1/3 of the crust. While the mantle makes up 85% of Earth by volume, we know very little about it. The mantle is like “a planet-sized lava lamp where material picks up heat at the core-mantle boundary, becomes less dense and rises in buoyant plumes to the lower edge of Earth’s crust, and then flows along that ceiling until it cools and sinks back toward the core. Circulation in the mantle is exceptionally languid: a round-trip might take 2 billion years.” — <a href="https://www.smithsonianmag.com/science-nature/decades-long-quest-drill-earths-mantle-may-soon-hit-pay-dirt-180957908/" rel="noreferrer nofollow">Smithsonian Magazine</a> THE LURE OF GREEN SPARKLE Recently, geologists recognized an outcropping in Maryland as mantle, part of the seafloor of a now-vanished ocean. “Mantle rock is generally full of sparkly green crystals of the mineral olivine, but these are surprisingly unremarkable: mottled yellow-brown stone occasionally flecked with black. “Those rocks have had a tough life,” says George Guice, a mineralogist at the Smithsonian’s National Museum of Natural History. Guice has long chased after sparkly green rocks, known to geologists as ultramafic. They’re rich in magnesium and make up the majority of our planet as the mantle. Ultramafic rocks form deep underground at high temperatures and pressures, so their minerals are not stable near Earth's surface. In this shallow environment, they're often exposed to hot fluids rushing through cracks, transforming their mineral makeup, as seen in the rocks strewn around Baltimore. Understanding the rock’s history through these changes, Guice says, is like looking through thick fog." — <a href="https://www.nationalgeographic.com/science/article/rare-chunks-of-earths-mantle-found-exposed-in-maryland" rel="noreferrer nofollow">National Geographic</a> SHINE BRIGHT LIKE AN EMERALD, FROM VESTA I recently procured this ultramafic beauty from a collection in Germany (procured from nomads in Mali). It is one of only 12 meteorites that are classified as diogenite-olivine or harzburgitic (greater than 40% olivine, and the orthopyroxene is magnesium-rich in contrast to conventional iron-rich orthopyroxene diogenites). It is the main mass of <a href="https://www.lpi.usra.edu/meteor/metbull.php?code=56073" rel="noreferrer nofollow">NWA 7370</a>, and is also high in chromite (15%), which can be seen as black notches protruding from the crust. Due to its higher melting point, the chromite resisted atmospheric ablation during Mach 32 entry better than the matrix. Vesta is the largest and brightest asteroid in the asteroid belt and the second largest body overall (after the dwarf planet Ceres), with an average diameter of about 525 km (326 miles). That is pretty close to the size of the State of Colorado. A billion years ago, two massive impacts ejected a large part of Vesta’s mass, and some of that material eventually was ejected from the asteroid belt by the resonant effects of Jupiter’s orbit, randomly, and it happened to land here on Earth. It’s astonishing to consider that when you look at photographs of Vesta, or even through a powerful telescope, the actual craters from which the HED meteorites were blasted out can easily be seen, such as Rheasilvia crater which is over 300 miles wide with conical residue at the center forming the tallest mountain in our solar system. The DAWN spacecraft orbited Vesta for a year, gathering data to match the “HED” meteorites on Earth. From the DAWN mission, we now know that Vesta is the only intact, layered planetary building block surviving from the very earliest days of the solar system, forming within the first 10 million years, long before Earth. The "swirl" texture that can be seen on the interior and exterior graphically displays the flowing and mixing of the olivine and orthopyroxene grains, with intermingled chromite crystals. “Vast underground chambers of magma churned and roiled, eventually cooling to the point at which orthopyroxene crystals froze out of the liquid rock. Insulated by kilometers of overlying rock and magma, they cooled slowly, growing into enormous sizes before settling downwards into vast piles of large crystals at the base of the underground caverns.” — Tim Gregory’s recent book <a href="https://www.flickr.com/photos/jurvetson/51000316812/">Meteorite</a>, p.102. Meteorites offer a preserved time capsule from the mantle’s depths, albeit from an alien world. Mineral

Olivine

Formula
(Mg,Fe)2SiO4
Mohs
6.5–7
Colour
Olive green
Mineral

Olkhonskite

olkhonskite

Formula
(Cr,V)2Ti3O9
Olmiite Locality: N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa (Locality at mindat.org) Size: 4.1 x 3.0 x 2.4 cm. Rich beige olmiite in crystallized spherical aggregates, from finds 4-5 years ago. Ex. Charlie Key Collection. Mineral

Olmiite

olmiite

Formula
CaMn[SiO3(OH)](OH)
A outstanding reddish single crystal of the very rare niobium-tantalum mineral olmsteadite from the type locality in South Dakota (Big Chief Mine, Keystone, Glendale, Pennington County, South Dakota, United States of America). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Olmsteadite

olmsteadite

Formula
KFe²⁺2(Nb5+,Ta5+)(PO4)2O2 * 2H2O
Mohs
4
Olsacherite Locality: El Dragón mine, Antonio Quijarro Province, Potosí Department, Bolivia (Locality at mindat.org) Picture width 2 mm. Collection and photograph Christian Rewitzer Mineral

Olsacherite

olsacherite

Formula
Pb2(SeO4)(SO4)
Mineral

Olsenite

olsenite

Formula
KFe4(PO4)3
Locality: Shijiangshan mine (Dashishan mine), Linxi, Linxi Co., Ulanhad League (Chifeng Prefecture), Inner Mongolia Autonomous Region, China Field of View: 15 mm Specimen analysed by Raman spectroscopy, SEM/EDS and XRD. Mineral

Olshanskyite

olshanskyite

Formula
Ca2[B3O3(OH)6]OH·3H2O