We use cookies to show content based on your preferences. If you continue to browse you accept their use and installation. More information. >

FMF - Friends of Minerals Forum, discussion and message board
The place to share your mineralogical experiences


Spanish message board






Newest topics and users posts
10 Aug-13:06:56 Re: presentation of new members - reference thread (Michael Shaw)
10 Aug-12:58:24 New administrator - peter farquhar (Peter Farquhar)
10 Aug-12:08:59 Re: calcite ? (Dany Mabillard)
10 Aug-12:03:25 Re: collection from dany mabillard (Dany Mabillard)
10 Aug-11:15:56 Re: don lum collection (Don Lum)
10 Aug-08:11:33 Re: popular minerals - twinned quartz (japan law twin) from colombia (Tobi)
10 Aug-08:06:36 Re: collection from dany mabillard (Tobi)
10 Aug-08:02:04 Re: don lum collection (Tobi)
10 Aug-01:45:42 Re: about cyclic twinning - (5) (James Catmur)
10 Aug-00:30:55 Re: calcite ? (Steveb)
09 Aug-23:07:54 Re: about cyclic twinning - (5) (Don Lum)
09 Aug-22:29:05 Re: about cyclic twinning - (5) (Kevin Conroy)
09 Aug-15:30:13 Re: about cyclic twinning - (5) (Don Lum)
09 Aug-14:38:08 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
09 Aug-14:28:35 Re: about cyclic twinning - (5) (Kevin Conroy)
09 Aug-12:02:30 Re: about cyclic twinning - (5) (Bob Morgan)
09 Aug-11:36:21 Re: calcite ? (Michael Shaw)
09 Aug-11:27:41 Re: calcite ? (Vic Rzonca)
09 Aug-11:10:11 Re: help needed for chinese locations (Dany Mabillard)
09 Aug-09:47:12 Re: help needed for chinese locations (Volkmar Stingl)
09 Aug-09:33:00 Calcite ? (Dany Mabillard)
09 Aug-07:45:29 Re: help needed for chinese locations (Dany Mabillard)
08 Aug-23:25:53 Re: don lum collection (Don Lum)
08 Aug-23:02:14 Re: don lum collection (Volkmar Stingl)
08 Aug-22:55:41 Re: collection of volkmar stingl (Volkmar Stingl)

For lists of newest topics and postings click here


RSS RSS

View unanswered posts

Why and how to register

Index Index
 FAQFAQ RegisterRegister  Log inLog in
 {Forgotten your password?}Forgotten your password?  

Like
70886


The time now is Aug 10, 2020 13:20

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
Search found 47 matches
Index
Author Message
  Topic: About cyclic twinning - (5)
Kevin Conroy

Replies: 133
Views: 174641

PostForum: Featured Columns of FMF   Posted: Aug 09, 2020 22:29   Subject: Re: About cyclic twinning - (5)
Don, thank you for posting these. The three specimens on the right side of the top row are superb, and clearly show the cyclic twinning that the Magnet Cove rutiles are famous for. I added stars o ...
  Topic: About cyclic twinning - (5)
Kevin Conroy

Replies: 133
Views: 174641

PostForum: Featured Columns of FMF   Posted: Aug 09, 2020 14:28   Subject: Re: About cyclic twinning - (5)
Bob, the Magnet Cove rutile sixlings/eightlings/sixteenlings and paramorphs definitely look different. If you could post a photo of yours I could give you my opinion of which it is.

Here's a rath ...
  Topic: About cyclic twinning - (5)
Kevin Conroy

Replies: 133
Views: 174641

PostForum: Featured Columns of FMF   Posted: Aug 05, 2020 22:48   Subject: Re: About cyclic twinning - (5)
Peter, I think that this is one of the most well written and referenced posts that I’ve seen. You’ve obviously written this because of a deep interest in these beauties.

However, I disagree with ...
  Topic: Lonsdaleite?
Kevin Conroy

Replies: 3
Views: 308

PostForum: What is it? - Where is it from?   Posted: Aug 03, 2020 16:18   Subject: Re: Lonsdaleite?
I would be VERY cautious about this! Please see: https://www.mindat.org/min-2431.html
  Topic: Pyrite?
Kevin Conroy

Replies: 11
Views: 1205

PostForum: What is it? - Where is it from?   Posted: Jun 24, 2020 20:29   Subject: Re: Pyrite?
Yes, it's pyrite. What you found is similar to the pyrite "suns" found in some coal mines in Illinois. Please see: https://www.mindat.org/gallery.php?loc=3758&min=3314
  Topic: Another "where is it from"
Kevin Conroy

Replies: 10
Views: 3418

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 20, 2020 18:28   Subject: Re: Another "where is it from"
I think that this may be from one of the Viburnum Trend mines. The shape of the pyrite, and the size and color of the dolomite crystals, is very similar to some that I've seen from the mid to southe ...
  Topic: Hematite Confirmation and Location
Kevin Conroy

Replies: 8
Views: 3667

PostForum: What is it? - Where is it from?   Posted: Mar 22, 2020 15:58   Subject: Re: Hematite Confirmation and Location
I don't know the location, but this looks like spinel-law twinned galena crystals.

The red-brown streak is not galena.

Yes, the streak is definitely not consistent with galena. To me it looks ...
  Topic: Hematite Confirmation and Location
Kevin Conroy

Replies: 8
Views: 3667

PostForum: What is it? - Where is it from?   Posted: Mar 22, 2020 15:05   Subject: Re: Hematite Confirmation and Location
I don't know the location, but this looks like spinel-law twinned galena crystals.
  Topic: Appropriate Photo Editing Software
Kevin Conroy

Replies: 8
Views: 13242

PostForum: Micros & Macros - Images of Minerals   Posted: Feb 27, 2020 16:54   Subject: Re: Appropriate Photo Editing Software
If you don't need stacking I would suggest Irfranview, a freeware.
  Topic: Collecting and imagining
Kevin Conroy

Replies: 28
Views: 19102

PostForum: Mineral Art and Artists   Posted: Feb 06, 2020 17:38   Subject: Re: Collecting and imagining.
This copper from New Cornelia Mine, Arizona, USA reminds me of a sargasso seahorse. Crystals to over 6 cm in length.
  Topic: Malachite ps azurite from Mibladen, Morocco?
Kevin Conroy

Replies: 9
Views: 4406

PostForum: What is it? - Where is it from?   Posted: Jan 15, 2020 13:25   Subject: Re: Malachite ps azurite from Mibladen, Morocco?
It may just be my computer screen, but are we sure that this is malachite after azurite? I'm getting a bluish hue, as if it's chrysocolla.

No matter where it's from it's a very aesthetic specimen ...
  Topic: Aragonite "buttons"
Kevin Conroy

Replies: 6
Views: 2580

PostForum: What is it? - Where is it from?   Posted: Dec 10, 2019 23:26   Subject: Re: Aragonite "buttons"
These were once referred to as "Indian money" aragonite, but I haven't heard this term used for quite a while. However, if you search for this term on Google you'll see several images.
  Topic: Uknown mineral specimen
Kevin Conroy

Replies: 4
Views: 1975

PostForum: What is it? - Where is it from?   Posted: Dec 01, 2019 09:35   Subject: Re: Uknown mineral specimen
Hi, I think that this is probably chalcedony after aragonite from Valle de las Plumas, Argentina.
  Topic: Keokuk.
Kevin Conroy

Replies: 15
Views: 3985

PostForum: What is it? - Where is it from?   Posted: Nov 19, 2019 20:23   Subject: Re: Keokuk.
I agree with Bob. You have a very aesthetic kaolinite geode, and I would keep it as is.
  Topic: Keokuk.
Kevin Conroy

Replies: 15
Views: 3985

PostForum: What is it? - Where is it from?   Posted: Nov 19, 2019 13:33   Subject: Re: Keokuk.
Jared, you nailed it. By the way, have you ever noticed a correlation between the presence of the kaolinite and some of the accesory minerals (especially sphalerite and barite)? As a collector I w ...
  Topic: Keokuk.
Kevin Conroy

Replies: 15
Views: 3985

PostForum: What is it? - Where is it from?   Posted: Nov 19, 2019 09:53   Subject: Re: Keokuk.
Hi Vic, I don't want to steal Bob's thunder as to the identification of the white stuff so I'll avoid answering that. I do want to pass on that geodes like this are found in several locations in Iow ...
  Topic: Buyers remorse, sellers remorse, donors remorse and more
Kevin Conroy

Replies: 18
Views: 7677

PostForum: Off-Topic and Introductions   Posted: Nov 19, 2019 09:43   Subject: Re: Buyers remorse, sellers remorse, donors remorse and more
I second Gail's comments on loaning specimens to museums. I had two cases of some of my better Missouri minerals in the Colorado School of Mines Museum. The loan was only for a year, and during th ...
  Topic: Specimens incorrectly labeled Bravoite coating Pyrite from Colorado
Kevin Conroy

Replies: 11
Views: 31096

PostForum: Incorrect classification and fakes   Posted: Nov 18, 2019 17:08   Subject: Re: Specimens incorrectly labeled Bravoite coating Pyrite from Colorado
I was just wondering if the molybdenum coatings were confirmed for the gray stuff on all of the pyrite from the Rico area mines. I'm having a little trouble finding references online so I figured I ...
  Topic: Unsure of mineral or stone, found in northeastern Colorado
Kevin Conroy

Replies: 12
Views: 2817

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Nov 18, 2019 09:04   Subject: Re: Unsure of mineral or stone, found in northeastern Colorado
You may want to contact Ed Raines at the Colorado School of Mines Museum. His contact information can be found in the lower right portion of the page:
https://www.mines.edu/geology-museum/
(link ...
  Topic: Unsure of mineral or stone, found in northeastern Colorado
Kevin Conroy

Replies: 12
Views: 2817

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Nov 16, 2019 09:20   Subject: Re: Unsure of mineral or stone , found in northeastern Colorado
This is a very good crystal, nice find! If possible do some tests on a lesser specimen. Maybe start with a test to see if it's a carbonate: put some drops of muriatic acid on it and see if bubbles ...
 
Page 1 of 3 Goto page 1, 2, 3  Next
All times are GMT - 5 Hours
Jump to:  


All pictures, text, design © Forum FMF 2006-2020


Powered by FMF