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Cause of coloration in green fluorite 12 Richard Arseneau 12809 Sep 18, 2017 15:08Roger Warin
interpretation of a geological map 13 Alex D. 14339 Sep 13, 2017 22:40Alex D.
Scientifically Identifying Minerals? 7 evin likes rocks 10151 Sep 02, 2017 07:01lluis
Can you identify this 'hedgehog'? 5 Steve Cole 8851 Aug 18, 2017 22:32Roger Warin
Oddities from Brandberg, Namibia 1 , 2 , 3 , 4 ] 70 Pierre Joubert 97618 Aug 16, 2017 10:48Pierre Joubert
Black or very dark background? 6 John S. White 9612 Aug 16, 2017 04:21Pierre Joubert
Ex so and so’s collection 1 , 2 ] 26 John S. White 27609 Aug 15, 2017 17:34Turbo
Erionite and cancer 6 James Catmur 9565 Aug 07, 2017 11:42cascaillou
Mannardite and Ankangite 4 BHmineral 6979 Aug 04, 2017 02:59marco campos-venuti
Calcite seen at Sainte-Marie-aux-Mines Show 2017 3 Jordi Fabre 5907 Aug 01, 2017 03:09Roger Warin
"Chrome" / yellow cerussite. Colour causing mechanisms. 1 Peter Olubas 5176 Jul 14, 2017 10:37Jordi Fabre
Public mining in Oaxaca, Mexico 12 ancientmttreasures 20425 Jul 12, 2017 04:06James Catmur
Tobermorite gets a mention on the BBC! 2 James Catmur 6034 Jul 05, 2017 12:00Peter Lemkin
Struggling to identify the green mineral 13 Joanna89 14997 Jul 01, 2017 13:10lluis
Quartz, Natural and Synthetic 1 , 2 , 3 ] 47 Elise 112932 Jun 29, 2017 08:14Jamison Brizendine
Trigonic Terminated Tourmaline? 2 texasdigger 6197 Jun 22, 2017 02:10lluis
Olivine gem from asteroid 0 Roger Warin 4749 Jun 10, 2017 16:21Roger Warin
Vivianite Oxidation 2 evin likes rocks 5839 May 26, 2017 10:57evin likes rocks
Cause of Blue, Green and Blue/Green Coloration of Cookeite 4 daviddillman 7546 May 03, 2017 18:02Ed Huskinson
N'Chwaning 1, 2, 3, Hotazel, Wessels - do you really care? 1 , 2 ] 22 bob kerr 23001 Mar 02, 2017 01:24Pierre Joubert
Montroydite from Terlingua, Texas 10 Tom Tucker 13806 Feb 23, 2017 16:33cascaillou
Negative crystals and their formation 7 Donn C. 10890 Feb 12, 2017 17:01John Jaszczak
Light sensitivity of cinnabar crystals (Chatian Mine, China)? 16 Tobi 18189 Feb 02, 2017 16:47Tom Tucker
Copper specimen from Zambia? 5 Pierre Joubert 8640 Jan 21, 2017 03:25Pierre Joubert
Epitaxial albite on microcline? 4 Josele 7893 Jan 18, 2017 14:01Josele
Spanish aragonite 4 Bob Carnein 6891 Jan 17, 2017 12:13Bob Carnein
Cristobalite / Libyan desert glass 3 Roger Warin 14464 Jan 16, 2017 11:27Roger Warin
Cechite from Ulldemolins 6 Cesar M. Salvan 12252 Jan 02, 2017 10:04Joan Rosell
Cristobalite in Lybian Desert Glass 7 Roger Warin 11514 Dec 25, 2016 08:45marco campos-venuti
Very unusual calcite crystal 5 Pete Richards 8366 Dec 22, 2016 06:28marco campos-venuti
Im loving this Beryl 5 texasdigger 7868 Dec 08, 2016 23:58Matt_Zukowski
Merelaniite - a new mineral from the famous tanzanite deposit 9 John Jaszczak 15872 Nov 26, 2016 13:30John Jaszczak
Please help identify this mineral/crystal. 1 , 2 ] 21 rhichens 23934 Nov 25, 2016 16:19James Catmur
Colorless crystals with sturmanite 6 Pete Richards 10921 Nov 25, 2016 11:29Roger Warin
Help needed identifying tumblestones 3 rick_bakker 7084 Nov 12, 2016 05:00prcantos
Turquoise-blue Fluorite from Cornwall UK 7 markbeckett 12168 Oct 15, 2016 11:11markbeckett
The Micro-World and inclusions in minerals 5 Elise 10863 Oct 05, 2016 13:04Elise
Why does Calcite fluoresce blue?? 19 Parvin 29367 Sep 30, 2016 13:54CranCowan
What makes calcite white vs. colorless? 6 df 11462 Sep 30, 2016 13:31CranCowan
Quartz with Muscovite (variety fuchsite) from Itremo, Madagascar 8 geofossile 11375 Sep 30, 2016 07:17geofossile
Rare quartz crystals 6 Peter Seroka 11598 Sep 19, 2016 04:28Harjo
How quartz crystals are formed. 8 Pierre Joubert 13162 Sep 16, 2016 09:42Pierre Joubert
Help with Chromium-rich Tremolite 3 GneissWare 5838 Sep 08, 2016 13:10GneissWare
Question about preserving weddellite specimens 2 Jim 5544 Sep 01, 2016 06:50Jim
Help with identifying collector 9 John S. White 9153 Aug 25, 2016 14:39John S. White
Azurite/Malachite pseudomorphs 1 dontgogreen 4198 Aug 15, 2016 11:24Les Presmyk
Rutile 8 William Hope Handy 8307 Jul 25, 2016 13:53kushmeja
Could anyone tell me what's these are, and If I should keep them or throw them out 7 Susan Hern 8661 Jul 14, 2016 11:21Peter Megaw
Help with identification 2 metwerks 6770 May 31, 2016 07:58Peter Megaw
Could this be a very rare limestone shatter cone from the UK? 18 James Hunt 24993 May 19, 2016 00:52James Catmur
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