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Purple Laker - Lake Superior - Rock Identification
  
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Smithsh6




Joined: 27 Nov 2017
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Location: Mississippi

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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:  330 Time(s)

20171127_104515.jpg



20171127_104123.jpg
 Mineral: Quartz
 Locality:
Lake Superior, Keweenaw County, Michigan, USA
 Dimensions: 8x6x4
 Description:
 Viewed:  326 Time(s)

20171127_104123.jpg


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Bob Harman




Joined: 06 Nov 2015
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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
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Susan Robinson




Joined: 05 Aug 2010
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Location: Hancock, MI

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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

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