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

FMF English Forum is moderated by John S. White and Peter Megaw
 

Spanish message board






Newest topics and users posts
25 Jan-18:25:22 Re: don lum collection (Don Lum)
25 Jan-17:52:33 Congratulations for the good news (Firmo Espinar)
25 Jan-16:57:59 The mizunaka collection - quartz (Am Mizunaka)
25 Jan-13:49:46 Re: what does this mean? (Lluis)
25 Jan-11:59:03 Re: what does this mean? (Jordi Fabre)
25 Jan-11:44:30 Re: what does this mean? (John Betts)
25 Jan-11:31:05 Re: what does this mean? (Stoned)
25 Jan-11:27:06 Re: what does this mean? (Pete Richards)
25 Jan-11:20:49 What does this mean? (Stoned)
24 Jan-18:00:21 Re: tucson show 2020 (Bob Kerr)
24 Jan-17:42:32 Re: tucson show 2020 (Bob Kerr)
24 Jan-16:00:49 Re: tucson show 2020 (Bob Morgan)
24 Jan-15:53:34 Re: tucson show 2020 (Raystraw)
24 Jan-09:16:16 Re: collection of michael shaw (Michael Shaw)
24 Jan-05:07:31 Re: tucson show 2020 (Roger Warin)
23 Jan-22:50:50 Re: tucson show 2020 (Alfredo)
23 Jan-22:16:36 Re: tucson show 2020 (Bob Kerr)
23 Jan-15:06:08 To get your bearings in tucson (Jordi Fabre)
23 Jan-10:47:35 Re: collection of firmo espinar (Firmo Espinar)
23 Jan-00:08:17 Re: the mizunaka collection - fluorite (Am Mizunaka)
22 Jan-19:06:39 Re: tucson show 2020 (Bob Harman)
22 Jan-16:56:02 Re: tucson show 2020 (Roger Warin)
22 Jan-12:41:04 Re: tucson show 2020 (Alfredo)
22 Jan-08:50:31 Re: the mizunaka collection - fluorite (Tobi)
22 Jan-01:38:42 The mizunaka collection - fluorite (Am Mizunaka)

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
61925


The time now is Jan 25, 2020 21:02

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
Spherical formations from a 1990s collection
  
  Index -> What is it? - Where is it from?
Like
5


View previous topic :: View next topic  
Author Message

John Betts




Joined: 07 Jun 2012
Posts: 160
Location: New York City

View user's profile

Send private message

PostPosted: Dec 01, 2019 15:16    Post subject: Spherical formations from a 1990s collection  

I have three thumbnail specimens from a collection assembled in the mid-1990s. Attached is a photo of a detail and two specimens.

The specimens are spherical formations 10-15 mm diameter and have lustrous black cubic crystals that look like bixbyite intermixed with transparent colorless parallel prismatic crystals that appear to be twinned like reticulated cerussite.

And one specimen has a group of pink cubo-octahedral crystals that could be fluorite. On the pink mineral are platy black-metallic crystals that look like platy hematite.



unknown.jpg
 Description:
 Viewed:  633 Time(s)

unknown.jpg



_________________
John Betts
Back to top
Reply to topic Reply with quote
Like
   

John Betts




Joined: 07 Jun 2012
Posts: 160
Location: New York City

View user's profile

Send private message

PostPosted: Dec 01, 2019 15:18    Post subject: Re: Spherical formations from a 1990s collection  

The collection had many specimens from Colorado and Utah, but that should not limit your suggestions.

Any suggestions for where these originated and the minerals?

_________________
John Betts
Back to top
Reply to topic Reply with quote
Like
   

Bob Carnein




Joined: 22 Aug 2013
Posts: 174
Location: Florissant, CO


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Dec 01, 2019 16:43    Post subject: Re: Spherical formations from a 1990s collection  

Can you give us any information about hardness/specific gravity? How about some higher resolution photos? The photos don't blow up very well.
Back to top
Reply to topic Reply with quote
Like
   

John Betts




Joined: 07 Jun 2012
Posts: 160
Location: New York City

View user's profile

Send private message

PostPosted: Dec 01, 2019 16:44    Post subject: Re: Spherical formations from a 1990s collection  

S.G. will not help as it is a mixture.

No fluorescence.
Not magnetic.
The pink mineral does not react to HCL.

_________________
John Betts
Back to top
Reply to topic Reply with quote
Like
   

John Betts




Joined: 07 Jun 2012
Posts: 160
Location: New York City

View user's profile

Send private message

PostPosted: Dec 01, 2019 16:47    Post subject: Re: Spherical formations from a 1990s collection  

Here is a larger photo of one.


unknown2.jpg
 Description:
 Viewed:  576 Time(s)

unknown2.jpg



_________________
John Betts
Back to top
Reply to topic Reply with quote
Like
   

Pete Richards
Site Admin



Joined: 29 Dec 2008
Posts: 663
Location: Northeast Ohio


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Dec 01, 2019 19:52    Post subject: Re: Spherical formations from a 1990s collection  

By golly, I have some too!

I received these as topaz epitactic/pseudomorphic after garnet from the Maynard Claim in the Thomas Range, Juab County, Utah. One of my specimens came from Lanny Ream, and the catalog entry says it was collected in 1994. The other two samples came from Dave Richerson with the same locality data.

While it is hard to see without "wiggling" the specimen around under the microscope, most of the topaz appears to be oriented in several directions consistent with overgrowing garnet.

Bixbyite and possibly hematite are also present; the "hematite" appears to be oriented as well.

Specimens are 1 to 2 cm in diameter.

I have no information about the pink material. Red beryl?



Topaz on Garnet 1.JPG
 Mineral: Topaz after garnet
 Dimensions: FOV about 2 cm
 Description:
 Viewed:  526 Time(s)

Topaz on Garnet 1.JPG



Topaz on Garnet 2.JPG
 Mineral: Topaz after garnet
 Locality:
Maynard's claim, Pismire Knolls Mount, Thomas Range, Juab County, Utah, USA
 Dimensions: About 1 cm
 Description:
Topaz oriented around [110] or [100] axis of garnet?
 Viewed:  525 Time(s)

Topaz on Garnet 2.JPG



Topaz on Garnet 3.JPG
 Mineral: Topaz after garnet
 Locality:
Maynard's claim, Pismire Knolls Mount, Thomas Range, Juab County, Utah, USA
 Dimensions: About 1 cm
 Description:
Topaz crystals oriented around garnet [111] axis?
 Viewed:  526 Time(s)

Topaz on Garnet 3.JPG



_________________
Collecting and studying crystals with interesting habits, twinning, and epitaxy
Back to top
Reply to topic Reply with quote
Like
5
   

John Betts




Joined: 07 Jun 2012
Posts: 160
Location: New York City

View user's profile

Send private message

PostPosted: Dec 01, 2019 20:10    Post subject: Re: Spherical formations from a 1990s collection  

That's it Pete! Thanks.
_________________
John Betts
Back to top
Reply to topic Reply with quote
Like
   

John Betts




Joined: 07 Jun 2012
Posts: 160
Location: New York City

View user's profile

Send private message

PostPosted: Dec 01, 2019 20:12    Post subject: Re: Spherical formations from a 1990s collection  

Your pic 2.jpg shows the exact thing I see in person, but was unable to photograph.
_________________
John Betts
Back to top
Reply to topic Reply with quote
Like
   
Display posts from previous:   
   Index -> What is it? - Where is it from?   All times are GMT - 5 Hours
Page 1 of 1
    

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


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


Powered by FMF