charly 0 Posted December 18, 2020 Share Posted December 18, 2020 Purple and red and orange striations, very dull luster, thanks for your help! Quote Link to post Share on other sites
Stillweaver hillbelli 344 Posted December 18, 2020 Share Posted December 18, 2020 Hardness? No scale to judge size. W A G , it' rhyolite that's been metamorphosed. Quote Link to post Share on other sites
Stillweaver hillbelli 344 Posted December 18, 2020 Share Posted December 18, 2020 Might be agate. Wiki has a page on it. Quote Link to post Share on other sites
Stillweaver hillbelli 344 Posted December 19, 2020 Share Posted December 19, 2020 (edited) Looks like your rock. Calling it ,"Hickoryite Jasper", final answer https://www.etsy.com/listing/888003390/polished-hickoryite-rhyolite-wonder?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=rhyolite+agate&ref=sr_gallery-1-9&frs=1 Edited December 19, 2020 by Stillweaver hillbelli Quote Link to post Share on other sites
Bedrock Bob 4,163 Posted December 19, 2020 Share Posted December 19, 2020 It's somewhere between quartz and jasper. The crystals look pretty big for jasper but it is obviously banding and flowing like a jasper. It is a form of silicon dioxide that formed under some pressure and not at the surface. It is not microcrystalline like a jasper but it looks like it is close. I call rocks like that quartzite. But that may not be the best description for that particular form of silicate rock. Quote Link to post Share on other sites
d_day 357 Posted December 19, 2020 Share Posted December 19, 2020 This could be so many things. It’s too hard to tell exactly what it is from just pictures. I think Bob may be on to something with the quartzite. It does have the appearance of quartzite, which is a metamorphosed quartz sandstone. It also looks like it could be a fairly grainy chert. It could be a number of other things with staining from chemical weathering. Quote Link to post Share on other sites
Stillweaver hillbelli 344 Posted December 19, 2020 Share Posted December 19, 2020 https://www.mindat.org/loc-27375.html Quote Link to post Share on other sites
Bedrock Bob 4,163 Posted December 20, 2020 Share Posted December 20, 2020 It's hematite. Rub it under the lid of the toilet tank. Quote Link to post Share on other sites
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