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Identity HelpSmokey Calcite

29th Mar 2015 04:49 UTCByron Thomas

Yes I said smokey Calcite is it real and how rare is it. I ask this question because today in my first collecting trip at a site in eastern Indiana when i was busting up a coral head the first wack knocked off some parts of the coral hear and lo and behold it looks like it is a smokey quartz. is this even possible? take a look yes i know the photo is not the best but it was taken with my iphone and was early in the morning with very bright light.

29th Mar 2015 06:44 UTCsteven garza

Dear Byron;

I know that roadcut well, in Union county; that 1st generation of calcites are just colored by petroleum inclusions. Should fluoresce like crazy. There are quite a few locations, that produce specimens just like that & are very attractive.

See you at Gilsum!

Your friend, Steve

29th Mar 2015 08:32 UTCBob Harman

BYRON, Steve is right. In Indiana some localities produce calcites with petroleum inclusions while other localities produce calcites with other inclusions such as marcasite. Commonly, the calcites are just cloudy and off "white" or colorless with a grayish appearance. Part of this discussion is how you wish to define "smoky" when it comes to calcite color.

BTW, rock collecting seems alive and well here in Indiana as every productive road cut had clubs and individuals out collecting this weekend. CHEERS…..BOB

29th Mar 2015 12:12 UTCJamison K. Brizendine 🌟 Expert

Bob, Steve and Byron,

I have two nearly identical specimens offered by Harris Precht, the pictured specimen is labeled as coming from Vulcan Materials Quarry, Monon, Indiana, and the other specimen labeled as Vulcan Materials Quarry, Pulaski County, Indiana. There are in fact two separate Vulcan Materials Quarries, one in Monon, White County, Indiana (40°50'35.14"N, 86°52'27.08"W) and one in Francesville, Pulaski County, Indiana (40°57'31.78"N, 86°53'14.83"W) 9 miles from each other. I agree with Bob that the coloring is probably due to hydrocarbon inclusions.

This one was labeled as coming from, Vulcan Materials Company Quarry - Monon Plant, Monon, White Co., Indiana, USA (5.5 x 2 x 2 cm)

I don't have a picture of the other specimen and I haven't seen any other examples of these calcites for sale from Harris, so I assume that are pretty rare or have been sold to mostly Indiana collectors.

29th Mar 2015 23:04 UTCByron Thomas

BOB yes i collected in the Richmond and south area and met up with some Dry Dredgers from Ohio and some others. It was cold as hell but I had to take the opportunity to get out and collect.

30th Mar 2015 01:19 UTCsteven garza

Dear Byron;

That's exactly where I was talking about; just can't remember the route #. other than a quarry, it's about the ONLY place to collect in eastern IN. Dave Straw & Mike Manning told me about that locale & I collected there; virtually the same type material (except more variety & larger, BETTER xls) comes from another roadcut in KY & a couple of quarries. MUCH less work, down here!

Your friend, Steve

30th Mar 2015 01:21 UTCsteven garza

Dear Byron;

Next time, contact me & plan to stay near Corydon, IN, for a BETTER trip!

Your friend, Steve

30th Mar 2015 03:16 UTCPaul Brandes 🌟 Manager

Years ago in the Alpena, MI area, folks used to find smoky brown coloured calcites that had petroleum inclusions in some of the local quarries that were called "stinkstone" because of the odour these specimens would produce if they were broken. Officially, the Michigan specimens are a variety of calcite called anthraconite. These sorts of specimens seem to be fairly common around the Great Lakes in the various basins where petroleum is also found.

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