Pegmatite rock with apatite crystals and pyrite?

fuss

Hero Member
Jul 27, 2018
563
820
Wisconsin
Primary Interest:
All Treasure Hunting
Found it protruding from a collapsing bluff along the Lake Michigan shoreline in SE Wi. Ok so the green mineral's have a white streak and have a hardness of 5, but interestingly they also seem to have dark inclusions in them (if you expand images 2 and 3 you will see this as well as the Pyrite? in image 3). If its not apatite what other options are there? same goes for the supposed pyrite. Thx.

green mineral rock2.jpg

green mineral.jpg

green mineral rock.jpg
 

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stdenis_jd

Hero Member
May 7, 2015
513
576
West Lower Peninsula, MI
Primary Interest:
Prospecting
Looks like some kind of amphibole, or a partially saussuritized (hydrothermally altered) plagioclase feldspar (altered partially to epidote).

Could be something else entirely, but that is the most likely. Definitely not apatite though :)
 

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