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Harkerite : Ca24Mg8Al2Si8(O,OH)32(BO3)8(CO3)8(H2O,Cl) | |
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Ariccia, Alban Hills, Rome Province, Latium, Italy brown octahedral crystal on Phlogopite, field of view 25 mm, collection and photograph Christof Schäfer |
| © C.H.M.-Schäfer | Photo ID: 60783 View Count: 481 |
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Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia A section of hausmannite matrix is broken to reveal one perfect 3mm+ crystal of harkerite and three negative impressions. |
| © e-Rocks.com | Photo ID: 129991 View Count: 299 |
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Tazheranskii Massif, Lake Baikal area, Irkutskaya Oblast', Prebaikalia (Pribaikal'e), Eastern-Siberian Region, Russia Altered octahedral crystals of Harkerite extracted from skarn. Associated minerals are blue calcite grains and white films of hydromagnesite. FOV is ~1.5x1 cm. Collected by Aleksei A. Konev in the end of 70th. Pavel M. Kartashov collection and photo. |
| © Pavel M. Kartashov | Photo ID: 215828 View Count: 97 |
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Tazheranskii Massif, Lake Baikal area, Irkutskaya Oblast', Prebaikalia (Pribaikal'e), Eastern-Siberian Region, Russia Light-grey octahedrons of Harkerite covered by beige alteration rims in skarn matrix. Associating minerals are: blue coarsegranular calcite, pinkish-brown low ferroan phlogopite, white to yellowish crusts of late formed hydromagnesite (on the upper edge of the sample). FOV is ~6x5 cm. Collected by Aleksei A. Konev in late 70th. Pavel M. Kartashov ... |
| © Pavel M. Kartashov | Photo ID: 214552 View Count: 77 |
Harkerite : Ca24Mg8Al2Si8(O,OH)32(BO3)8(CO3)8(H2O,Cl), Magnetite : Fe2+Fe3+2O4, Löllingite : FeAs2 | |
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Titovskoe B deposit, Tas-Khayakhtakh Range, Dogdo River Basin, Polar Yakutia, Saha Republic (Sakha Republic; Yakutia), Eastern-Siberian Region, Russia Greyish sugar-like almost monomineral harkerite rock. It is impossible to distinguish harkerite rock from sakhaite one on the locality. Minor difference in mineral associations (for example this rock don't contain any ludwigite, but magnetite and lollingite grains are present) allow us to suspect, that this isn't sakhaite. Only IRS or microprobe ... |
| © Pavel M. Kartashov | Photo ID: 140432 View Count: 208 |
Harkerite : Ca24Mg8Al2Si8(O,OH)32(BO3)8(CO3)8(H2O,Cl), Magnetite : Fe2+Fe3+2O4, Calcite : CaCO3 | |
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Broadford, Isle of Skye, North West Highlands (Inverness-shire), Scotland, UK Outlines of translucent harkerite crystals, to 0.1 cm in diameter, embedded in calcite, with magnetite. S402-435 Excalibur Mineral specimen. |
| © 2008, JGW | Photo ID: 187770 View Count: 83 |
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Kilchrist, Broadford, Isle of Skye, North West Highlands (Inverness-shire), Scotland, UK White sections of the crystals of harkerite, a very complex Ca-Mg-Al silicate borate carbonate hydroxide "hydrate/chloride", one of two known natural silicate-borate-carbonate minerals (by recently found britvinite) and the only Ca-Mg-(Al)-Si-B-C-O mineral. The "white area" is 1.9 cm wide. Here, harkerite is associated with minor beige-coloured ... |
| © Ł Kruszewski 08 | Photo ID: 173787 View Count: 91 |
Harkerite : Ca24Mg8Al2Si8(O,OH)32(BO3)8(CO3)8(H2O,Cl) | |
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Marble quarries, Kilchrist, Broadford, Isle of Skye, North West Highlands (Inverness-shire), Scotland, UK dimension area mm. 4 x 4 photo and collection Luigi Chiappino |
| © luigi chiappino | Photo ID: 230641 View Count: 31 |
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