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Let's Rock => Identifications of Materials => Topic started by: VegasJames on October 28, 2018, 12:04:33 AM

Title: Obsidian or porcelain jasper
Post by: VegasJames on October 28, 2018, 12:04:33 AM: I had this posted elsewhere and I posted it as an obsidian, which is what it looks like to me but a poster said it was porcelain jasper. Any opinions?

(https://farm1.staticflickr.com/921/40616073435_8aa18af0f2_c.jpg) (https://flic.kr/p/24T6ZAc)20180413_141506 (https://flic.kr/p/24T6ZAc) by James Sloane (https://www.flickr.com/photos/143011703@N05/), on Flickr
Title: Re: Obsidian or porcelain jasper
Post by: Slabbercabber on October 28, 2018, 07:49:14 AM: How hard is it? Streak?
Title: Re: Obsidian or porcelain jasper
Post by: VegasJames on October 28, 2018, 08:46:47 AM: Quote from: Slabbercabber on October 28, 2018, 07:49:14 AM
How hard is it? Streak?

I did not test those and I am not home to check right now. Will check those when I get home.
Title: Re: Obsidian or porcelain jasper
Post by: VegasJames on November 07, 2018, 11:32:55 PM: Quote from: Slabbercabber on October 28, 2018, 07:49:14 AM
How hard is it? Streak?

Cannot scratch it with a quartz crystal and leaves no streak on an streak plate.
Title: Re: Obsidian or porcelain jasper
Post by: vitzitziltecpatl on November 08, 2018, 06:30:32 AM: The orange colors are right for cheetah "agate" from Brazil. Doesn't have the black spots, but maybe it could be from a transitional zone or edge of a deposit where there was more black.

I can't think of anything else with those shades of orange in that hardness range.
Title: Re: Obsidian or porcelain jasper
Post by: Jhon P on November 08, 2018, 08:51:23 AM: Jasper, Did you find it or buy it? There is a variety of jasper found through out Nevada.
Title: Re: Obsidian or porcelain jasper
Post by: VegasJames on November 08, 2018, 01:11:03 PM: Quote from: vitzitziltecpatl on November 08, 2018, 06:30:32 AM
The orange colors are right for cheetah "agate" from Brazil. Doesn't have the black spots, but maybe it could be from a transitional zone or edge of a deposit where there was more black.

I can't think of anything else with those shades of orange in that hardness range.

This was found in Central Nevada.
Title: Re: Obsidian or porcelain jasper
Post by: VegasJames on November 08, 2018, 01:15:33 PM: Quote from: Jhon P on November 08, 2018, 08:51:23 AM
Jasper, Did you find it or buy it? There is a variety of jasper found through out Nevada.

I found this in Central Nevada. The area I was searching is supposed to have a bed of obsidian, which is one of the reasons I thought it was an obsidian. But hardness does seem to rule that out.

I did find some black agate, orange chalcedony, some butterscotch colored jasper, some miscellaneous other jaspers, common opal and andesite in the same area.
Title: Re: Obsidian or porcelain jasper
Post by: vitzitziltecpatl on November 08, 2018, 04:28:37 PM: Well then, some kind of Nevada Jasper it is... .
Title: Re: Obsidian or porcelain jasper
Post by: Greg Hiller on November 14, 2018, 10:31:23 AM: Should be super brittle and flake off with the characteristic obsidian break if it is obsidian. From what I can see on the edge does not look like the fractures have that volcanic glass look. Perhaps you should see if it can take out one of the white walkers, that would prove it is dragon glass, right?

Nice piece in any case!
Title: Re: Obsidian or porcelain jasper
Post by: VegasJames on November 14, 2018, 03:34:26 PM: That dip on the right does look a lot like how obsidian flakes. The hardness rules out obsidian though.