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
20 Aug-03:22:15 Re: ferberite, pyrite, siderite, and..... ? (Jorge Santos Garcia)
20 Aug-03:18:56 Re: collection of heimo hellwig (Heimo Hellwig)
20 Aug-03:06:27 Re: crystal cavity + green vein poss. Chlorite? (Peter Lemkin)
19 Aug-23:04:59 Re: question about fluorite on quartz (Robert Seitz)
19 Aug-20:11:06 Re: ferberite, pyrite, siderite, and..... ? (Justin Hickok)
19 Aug-17:07:41 Re: collection of heimo hellwig (Franjungle)
19 Aug-16:31:42 Re: question about fluorite on quartz (Protium)
19 Aug-16:11:36 Re: collection of fiebre verde - coscuez (#708) (Fiebre Verde)
19 Aug-14:07:39 Re: crystal cavity + green vein poss. Chlorite? (Kara)
19 Aug-13:27:25 Re: crystal cavity + green vein poss. Chlorite? (Peter Megaw)
19 Aug-13:03:34 Re: crystal cavity + green vein poss. Chlorite? (Peter Lemkin)
19 Aug-12:45:44 Re: question about fluorite on quartz (Peter Megaw)
19 Aug-09:49:30 Re: question about fluorite on quartz (Protium)
19 Aug-09:35:37 Re: question about fluorite on quartz (Peter Megaw)
19 Aug-08:54:35 Re: question about fluorite on quartz (Protium)
19 Aug-08:48:14 Re: crystal cavity + green vein poss. Chlorite? (Peter Megaw)
19 Aug-08:37:38 Re: mineral id help. (Matt_zukowski)
19 Aug-08:34:17 Re: ferberite, pyrite, siderite, and..... ? (Mathias)
19 Aug-08:29:08 Crystal cavity + green vein poss. Chlorite? (Kara)
19 Aug-07:43:35 Re: ferberite, pyrite, siderite, and..... ? (Jordi Fabre)
19 Aug-07:28:02 Re: mineral id help. (Jordi Fabre)
19 Aug-05:20:23 Re: mineral id help. (John S. White)
19 Aug-05:12:35 Re: abrasives repairing polishing crystals (Diamond)
19 Aug-04:02:54 Re: abrasives repairing polishing crystals (Duncan Miller)
19 Aug-03:36:59 Re: collection of philippe durand (Philippe Durand)

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
44977


The time now is Aug 20, 2018 04:03

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
Purple Laker - Lake Superior - Rock Identification
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
Like


View previous topic :: View next topic  
Author Message

Smithsh6




Joined: 27 Nov 2017
Posts: 1
Location: Mississippi

View user's profile

Send private message

PostPosted: Nov 27, 2017 13:29    Post subject: Purple Laker - Lake Superior - Rock Identification  

I went on my first rock hunting expedition. I found this 10.5 ounce purple laker. Can anyone tell me what it is made of or called. Does it have any value or can it be used for jewelry? Should I cut it open?


20171127_104515.jpg
 Mineral: Quartz
 Locality:
Lake Superior, Keweenaw County, Michigan, USA
 Dimensions: 8x6x4
 Description:
 Viewed:  1237 Time(s)

20171127_104515.jpg



20171127_104123.jpg
 Mineral: Quartz
 Locality:
Lake Superior, Keweenaw County, Michigan, USA
 Dimensions: 8x6x4
 Description:
 Viewed:  1228 Time(s)

20171127_104123.jpg


Back to top
Reply to topic Reply with quote
Like
   

Bob Harman




Joined: 06 Nov 2015
Posts: 385
Location: Indiana


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 27, 2017 13:56    Post subject: Re: Purple Laker - Lake Superior - Rock Identification  

Just like your pictures say; cryptocrystalline or microcrystalline quartz, commonly called quartzite. Many colors can be found including purplish hues. Altho purplish, I doubt it would be considered akin to amethyst variety of quartz.
They can be used in lapidary after being evaluated by a knowledgable person. Used for free form pendants etc. Probably cannot be faceted.
As to value, this is not the proper forum to ask for value, but in general, examples such as yours have very little monetary value. BOB
Back to top
Reply to topic Reply with quote
Like
   

Susan Robinson




Joined: 05 Aug 2010
Posts: 138
Location: Hancock, MI

View user's profile

Send private message

PostPosted: Nov 27, 2017 18:05    Post subject: Re: Purple Laker - Lake Superior - Rock Identification  

Are you certain it's quartz? Some of the massive prehnite found on the beaches can look like that, too. I see some pinkish areas, typical of the prehnite from the Keweenaw, and there is also a repeating pattern of light-colored, very narrow lines shown on the specimen, possibly from the growth pattern of the prehnite.

I would strongly suggest a hardness test to be positive that it's quartz.

Susan Robinson

_________________
Susan Robinson
Back to top
Reply to topic Reply with quote
Like
   
Display posts from previous:   
   Index -> FOR BEGINNERS: 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 2006-2018


Powered by FMF