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Anhydrite : CaSO4 | |
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Kohnstein Quarry, Niedersachswerfen, Nordhausen, Harz Mts, Thuringia, Germany A colourless, perfect crystal of anhydrite. Picture size 30 mm. |
| © Thomas Witzke | Photo ID: 243604 View Count: 22 |
Celestine : SrSO4 | |
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Kohnstein Quarry, Niedersachswerfen, Nordhausen, Harz Mts, Thuringia, Germany A honey-brown crystal of celestine on anhydrite. Picture size 10 mm. |
| © Thomas Witzke | Photo ID: 243605 View Count: 17 |
Hausmannite : MnMn2O4 | |
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Manganese deposit, Ilfeld, Nordhausen, Harz Mts, Thuringia, Germany Bipyramidal crystals to 7 mm, on barite. P Haas photograph and collection (no. 42-007). |
| © Peter Haas | Photo ID: 19491 View Count: 507 |
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Ilfeld, Nordhausen, Harz Mts, Thuringia, Germany 8.3 x 6.4 x 4.0 cm. A superb, old-time specimen from the famous Ilfeld area of the Harz Mountains. This very sculptural specimen has a large vug filled with lustrous, jet-black hausmannite pseudomorphs after manganite crystals in a matrix of massive hausmannite (according to the Collectors Edge label with it, where it was analyzed). The ... |
| © Rob Lavinsky | Photo ID: 183000 View Count: 133 |
Hausmannite : MnMn2O4, Manganite : Mn3+O(OH) | |
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Ilfeld, Nordhausen, Harz Mts, Thuringia, Germany 4.4 x 2.3 x 1.9 cm. On this piece, hausmannite has replaced the previous generation of manganite crystals. |
| © Rob Lavinsky | Photo ID: 180081 View Count: 110 |
Hausmannite : MnMn2O4, Manganite : Mn3+O(OH) | |
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Ilfeld, Nordhausen, Harz Mts, Thuringia, Germany 3.6 x 3.5 x 2.4 cm. This is a fine specimen, with very distinct, well-formed crystals to 1.8 cm. |
| © Rob Lavinsky | Photo ID: 180082 View Count: 99 |
Hausmannite : MnMn2O4, Manganite : Mn3+O(OH) | |
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Manganese deposit, Ilfeld, Nordhausen, Harz Mts, Thuringia, Germany 2 cm crystals of hausmannite replacing manganite. S409-105 Gunnar Farber specimen. |
| © 2009, JGW | Photo ID: 263076 View Count: 9 |
Heidornite : Na2Ca3B5O8(SO4)2Cl(OH)2 | |
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Kohnstein Quarry, Niedersachswerfen, Nordhausen, Harz Mts, Thuringia, Germany Colourless crystal of heidornite. Picture size 5 mm. Photographer and collection Thomas Witzke. |
| © Thomas Witzke | Photo ID: 11144 View Count: 786 |
Heidornite : Na2Ca3B5O8(SO4)2Cl(OH)2 | |
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Kohnstein Quarry, Niedersachswerfen, Nordhausen, Harz Mts, Thuringia, Germany 0.4 cm crystal. Locality given simply as "Harz Mountains" Excalibur Mineral specimen. S350-19 |
| © 2008, JGW | Photo ID: 149596 View Count: 103 |
Hydroboracite : CaMg[B3O4(OH)3]2 · 3H2O | |
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Kohnstein Quarry, Niedersachswerfen, Nordhausen, Harz Mts, Thuringia, Germany 4x5 cm |
| © Volker Betz | Photo ID: 174134 View Count: 337 |
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