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Is this quartz? And if so I'm interested in knowing what kind

0 votes

Hi there,  

Looking for help in identifying this rock.  If it is quartz id like to know what kind, estimated worth etc.  I found it on the shores of Lake Michigan.  It looks as though it has quite a bit of dark tones deep on the inside. Measures about 7x7x5 with small yellow impurities in the cracks but that may just be dirt.  Thank you in advance for your help and hope to be posting a lot more soon! :)

asked Aug 29, 2015 by Laura Schetter (120 points)

2 Answers

0 votes

It looks to be common quartz. The staining may be impurities or it might be limonite, which is an iron trace found in many Great Lakes rocks. Darker quartz, purple in color is amethyst, reddish tones are called rosy quartz, dark tones, smoky quartz. All are found commonly in the Great Lakes area. This specimen in my hand has agate, white quartz and in the center amethyst. They are only worth what someone will pay. Yours is very large. Some might want to carve it into something so it may have some worth. It's cool. I have some from Lake Superior which are fully smoothed into egg-shapes as large as my fist. We welcome all inqiries, especially with pictures and source information.

answered Aug 30, 2015 by Weasel (58,800 points)
0 votes
This is sometimes called milk quartz. It is the most common type of quartz.
answered Aug 31, 2015 by Birthstones.eu (1,600 points)

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