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How common is pyrite disease?
6
Richard Arseneau
8034
Sep 20, 2017 19:17Pete Richards
Cause of coloration in green fluorite
12
Richard Arseneau
13140
Sep 18, 2017 15:08Roger Warin
interpretation of a geological map
13
Alex D.
14680
Sep 13, 2017 22:40Alex D.
Scientifically Identifying Minerals?
7
evin likes rocks
10345
Sep 02, 2017 07:01lluis
Can you identify this 'hedgehog'?
5
Steve Cole
9060
Aug 18, 2017 22:32Roger Warin
Oddities from Brandberg, Namibia
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70
Pierre Joubert
99084
Aug 16, 2017 10:48Pierre Joubert
Black or very dark background?
6
John S. White
9831
Aug 16, 2017 04:21Pierre Joubert
Ex so and so’s collection
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26
John S. White
28210
Aug 15, 2017 17:34Turbo
Erionite and cancer
6
James Catmur
9823
Aug 07, 2017 11:42cascaillou
Mannardite and Ankangite
4
BHmineral
7134
Aug 04, 2017 02:59marco campos-venuti
Calcite seen at Sainte-Marie-aux-Mines Show 2017
3
Jordi Fabre
6021
Aug 01, 2017 03:09Roger Warin
"Chrome" / yellow cerussite. Colour causing mechanisms.
1
Peter Olubas
5363
Jul 14, 2017 10:37Jordi Fabre
Public mining in Oaxaca, Mexico
12
ancientmttreasures
21104
Jul 12, 2017 04:06James Catmur
Tobermorite gets a mention on the BBC!
2
James Catmur
6176
Jul 05, 2017 12:00Peter Lemkin
Struggling to identify the green mineral
13
Joanna89
15279
Jul 01, 2017 13:10lluis
Quartz, Natural and Synthetic
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47
Elise
114008
Jun 29, 2017 08:14Jamison Brizendine
Trigonic Terminated Tourmaline?
2
texasdigger
6325
Jun 22, 2017 02:10lluis
Olivine gem from asteroid
0
Roger Warin
4979
Jun 10, 2017 16:21Roger Warin
Vivianite Oxidation
2
evin likes rocks
5954
May 26, 2017 10:57evin likes rocks
Cause of Blue, Green and Blue/Green Coloration of Cookeite
4
daviddillman
7674
May 03, 2017 18:02Ed Huskinson
N'Chwaning 1, 2, 3, Hotazel, Wessels - do you really care?
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22
bob kerr
23396
Mar 02, 2017 01:24Pierre Joubert
Montroydite from Terlingua, Texas
10
Tom Tucker
14083
Feb 23, 2017 16:33cascaillou
Negative crystals and their formation
7
Donn C.
11182
Feb 12, 2017 17:01John Jaszczak
Light sensitivity of cinnabar crystals (Chatian Mine, China)?
16
Tobi
18556
Feb 02, 2017 16:47Tom Tucker
Copper specimen from Zambia?
5
Pierre Joubert
8821
Jan 21, 2017 03:25Pierre Joubert
Epitaxial albite on microcline?
4
Josele
8053
Jan 18, 2017 14:01Josele
Spanish aragonite
4
Bob Carnein
7039
Jan 17, 2017 12:13Bob Carnein
Cristobalite / Libyan desert glass
3
Roger Warin
14665
Jan 16, 2017 11:27Roger Warin
Cechite from Ulldemolins
6
Cesar M. Salvan
12527
Jan 02, 2017 10:04Joan Rosell
Cristobalite in Lybian Desert Glass
7
Roger Warin
11760
Dec 25, 2016 08:45marco campos-venuti
Very unusual calcite crystal
5
Pete Richards
8521
Dec 22, 2016 06:28marco campos-venuti
Im loving this Beryl
5
texasdigger
8037
Dec 08, 2016 23:58Matt_Zukowski
Merelaniite - a new mineral from the famous tanzanite deposit
9
John Jaszczak
16049
Nov 26, 2016 13:30John Jaszczak
Please help identify this mineral/crystal.
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21
rhichens
24236
Nov 25, 2016 16:19James Catmur
Colorless crystals with sturmanite
6
Pete Richards
11063
Nov 25, 2016 11:29Roger Warin
Help needed identifying tumblestones
3
rick_bakker
7161
Nov 12, 2016 05:00prcantos
Turquoise-blue Fluorite from Cornwall UK
7
markbeckett
12268
Oct 15, 2016 11:11markbeckett
The Micro-World and inclusions in minerals
5
Elise
10979
Oct 05, 2016 13:04Elise
Why does Calcite fluoresce blue??
19
Parvin
29654
Sep 30, 2016 13:54CranCowan
What makes calcite white vs. colorless?
6
df
11561
Sep 30, 2016 13:31CranCowan
Quartz with Muscovite (variety fuchsite) from Itremo, Madagascar
8
geofossile
11493
Sep 30, 2016 07:17geofossile
Rare quartz crystals
6
Peter Seroka
11705
Sep 19, 2016 04:28Harjo
How quartz crystals are formed.
8
Pierre Joubert
13251
Sep 16, 2016 09:42Pierre Joubert
Help with Chromium-rich Tremolite
3
GneissWare
5895
Sep 08, 2016 13:10GneissWare
Question about preserving weddellite specimens
2
Jim
5605
Sep 01, 2016 06:50Jim
Help with identifying collector
9
John S. White
9250
Aug 25, 2016 14:39John S. White
Azurite/Malachite pseudomorphs
1
dontgogreen
4248
Aug 15, 2016 11:24Les Presmyk
Rutile
8
William Hope Handy
8402
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
8754
Jul 14, 2016 11:21Peter Megaw
Help with identification
2
metwerks
6833
May 31, 2016 07:58Peter Megaw
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