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20 Sep-10:11:01 Re: what rock is this? (Pete Modreski)
20 Sep-09:08:35 Re: what rock is this? (Lluis)
20 Sep-09:03:03 Re: collection of michael shaw (Michael Shaw)
20 Sep-04:08:12 Re: what rock is this? (Josele)
19 Sep-14:11:25 Re: collection of firmo espinar (Firmo Espinar)
19 Sep-10:35:53 Re: what rock is this? (Lluis)
19 Sep-10:33:08 Re: what rock is this? (Carles Millan)
19 Sep-10:24:12 Re: what rock is this? (Roger Warin)
19 Sep-10:15:05 Re: what rock is this? (Josele)
19 Sep-09:10:06 Re: collection of michael shaw (Michael Shaw)
19 Sep-07:09:55 Re: what rock is this? (Carles Millan)
19 Sep-06:12:44 What rock is this? (Roxana Roxy)
19 Sep-02:26:11 Re: collection of michael shaw (Enrique Llorens)
18 Sep-16:28:05 Re: collection of michael shaw (Michael Shaw)
18 Sep-15:01:59 Re: don lum collection (Don Lum)
18 Sep-13:19:38 Re: don lum collection (Michael Shaw)
16 Sep-12:01:08 Re: i want to know the name of this rock. (Bernardo_azevedo)
16 Sep-11:37:42 Re: donating funds - rock currier collection auction (Bob Harman)
16 Sep-11:07:13 Re: donating funds - rock currier collection auction (Bergur_e_sigurdarson)
16 Sep-10:42:37 Re: donating funds - rock currier collection auction (Bob Harman)
16 Sep-10:06:16 Re: i want to know the name of this rock. (Gail)
16 Sep-09:19:41 Re: i want to know the name of this rock. (Kevin Schofield)
15 Sep-09:47:19 Re: collection from dany mabillard (Dany Mabillard)
14 Sep-23:42:20 Re: monthly mineral chronicles, mineral guides and more... (Crocoite)
14 Sep-23:40:13 Re: monthly mineral chronicles, mineral guides and more... (Crocoite)

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Author Message
  Topic: May I get a read
Matt_Zukowski

Replies: 6
Views: 425

PostForum: What is it? - Where is it from?   Posted: Sep 12, 2019 16:11   Subject: Re: may i get a read
The last picture seems to show conchoidal fracture, indicating that it probably glass. The rocks also look water or wind worn, which would suggest that perhaps your hardness measurements are off.
  Topic: Fake Ruby?
Matt_Zukowski

Replies: 13
Views: 1486

PostForum: What is it? - Where is it from?   Posted: Jun 02, 2019 13:01   Subject: Re: Fake Ruby?
Soak it in solvent and see if any glue dissolves.
  Topic: Any hint on the location where this baryte was mined?
Matt_Zukowski

Replies: 21
Views: 2186

PostForum: What is it? - Where is it from?   Posted: May 08, 2019 19:32   Subject: Re: Any hint on the location where this baryte was mined?
This is a stumper. Sorry to bring this up bit is there any way it could have been faked? Have you tried to figure out if the barite has been glued onto that matrix?
  Topic: rock id help
Matt_Zukowski

Replies: 14
Views: 1457

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 08, 2019 19:23   Subject: Re: rock id help
Looks like a volcanic rock to me.

Fuss - we are really not the right forum for you to pose ID requests on rocks. We focus on mineral specimens. To understand what we mean by mineral specimens, po ...
  Topic: Galena, Kommern
Matt_Zukowski

Replies: 42
Views: 3948

PostForum: What is it? - Where is it from?   Posted: Apr 21, 2019 06:00   Subject: Re: Galena, Kommern
Is there a reason why you could not use a heat test to see if it is bismuth? Bismuth melts at 271.4°C (520.5°F) which is a temperature that can be achieved in an ordinary oven.
  Topic: Stump the experts! What is it.
Matt_Zukowski

Replies: 3
Views: 766

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Mar 21, 2019 21:38   Subject: Re: Stump the experts! What is it.
The flat surfaces are probably just joints and the rock is a chert or limestone or something else. Do scratch and acid tests. Although unlikely from the photo, if you are in a pegmatite, perhaps thi ...
  Topic: Shaping a crystal quartz point, wand, obelisk
Matt_Zukowski

Replies: 9
Views: 1650

PostForum: Off-Topic and Introductions   Posted: Jan 30, 2019 23:36   Subject: Re: Shaping a crystal quartz point, wand, obelisk
Pete, do you know about:
https://www.smorf.nl/3dprints.php
  Topic: Calcite? (from Tsumeb)
Matt_Zukowski

Replies: 8
Views: 1321

PostForum: What is it? - Where is it from?   Posted: Dec 20, 2018 11:48   Subject: Re: Calcite? (from Tsumeb)
Could it also be aragonite? Look at this picture: https://www.mindat.org/photo-69326.html

As Jordi says, the next step is fizzing it. Do be careful to know what is fizzing - there can be calcite ...
  Topic: Varying hematite crystals
Matt_Zukowski

Replies: 5
Views: 1277

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Nov 26, 2018 23:01   Subject: Re: Varying hematite crystals
What you have does look like it could be hematite - i think i can see hexagonal symmetry in some of the xtals. A red streak from a grey metallic mineral with the right hardness is pretty diagnostic f ...
  Topic: Black mineral ID help needed
Matt_Zukowski

Replies: 13
Views: 2078

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Nov 24, 2018 18:43   Subject: Re: Black mineral ID help needed
Picture 6 certainly looks like quartz to me.
  Topic: Munich Show (Mineralientage) 2018
Matt_Zukowski

Replies: 40
Views: 18822

PostForum: News about shows   Posted: Oct 30, 2018 01:21   Subject: Re: Munich Show (Mineralientage) 2018
I love it that they put chemical formulas on the labels!

Thanks for sharing Jordi.
  Topic: Need assistance with unidenified Minerals
Matt_Zukowski

Replies: 6
Views: 1249

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Oct 28, 2018 21:55   Subject: Re: Need assistance with unidenified Minerals
WE do not discuss value here. But if you want, go to EBay and search for pyromorphite and you will find plenty of examples with prices on them.
  Topic: collection insurance?
Matt_Zukowski

Replies: 17
Views: 3099

PostForum: Off-Topic and Introductions   Posted: Oct 24, 2018 17:25   Subject: Re: collection insurance?
My auto, home, and umbrella is with one large insurance company. They originally agreed to insure my collection but then 6 months later told me that they did not have enough experience to underwrite ...
  Topic: Roadside Geology of Vermont
Matt_Zukowski

Replies: 10
Views: 2922

PostForum: FMF Guide of Rocks   Posted: Sep 13, 2018 21:40   Subject: Re: Roadside Geology of Vermont
I thought this post was going to be about the excellent Roadside Geology book series. One of the books in this series is called Roadside Geology of Vermont and New Hampshire.

These books discuss t ...
  Topic: Mineral identification
Matt_Zukowski

Replies: 15
Views: 2934

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 21, 2018 11:44   Subject: Re: Mineral identification
What is the shape of the xtals if you look down their long axes? A square, a hexagon, a rectangle?
  Topic: Mineral ID help.
Matt_Zukowski

Replies: 11
Views: 2621

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 19, 2018 08:37   Subject: Re: Mineral ID help.
I think John was right to call Bob Harman out on this. Bob simply should not have called Justin out like this without PMing Justin and the admins of this forum. But Bob H is also a good member of th ...
  Topic: Fungal etching of garnets?
Matt_Zukowski

Replies: 0
Views: 1084

PostForum: Minerals and Mineralogy   Posted: Aug 09, 2018 04:26   Subject: Fungal etching of garnets?
From the NYT:

Something Digs Intricate Tunnels in Garnets. Is It Alive? :
  Topic: Green slime
Matt_Zukowski

Replies: 8
Views: 2943

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 13, 2018 21:27   Subject: Re: Green slime
Sure looks like slag to me.
  Topic: Question regarding Portuguese minerals
Matt_Zukowski

Replies: 3
Views: 1796

PostForum: Mines and Mineral Localities   Posted: Jun 21, 2018 20:34   Subject: Re: Question regarding Portuguese minerals
To look more broadly at Portuguese minerals, go to the mindat page for that country:
https://www.mindat.org/loc-14425.html

There you will find some basic info on the country, a list of all the min ...
  Topic: Breakfast With Minerals - Podcast Discussion - Episode 01
Matt_Zukowski

Replies: 45
Views: 15050

PostForum: Blue Cap Productions   Posted: May 10, 2018 22:59   Subject: Re: Breakfast With Minerals - Podcast Discussion - Episode 01
Sorry Bob C, but the Enterprise is a star ship.
 
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