krock827
off to a rocking start
Member since August 2019
Posts: 1
|
Post by krock827 on Aug 7, 2019 2:27:00 GMT -5
|
|
|
|
Post by Peruano on Aug 7, 2019 6:22:20 GMT -5
One wild guess is that it is a tumbled piece of hematite. Scratch the red part across a light rock and see if you get a red streak. It definitely had a botryoidal structure at one time.
|
|
Fossilman
Cave Dweller 
Member since January 2009
Posts: 20,718 
|
Post by Fossilman on Aug 7, 2019 9:57:28 GMT -5
We just call them a botryoidal agate....
|
|
lookatthat
Cave Dweller
Whatever there is to be found.
Member since May 2017
Posts: 1,360 
|
Post by lookatthat on Aug 7, 2019 10:05:44 GMT -5
I would not say feldspar... quartz family most likely. It's pretty cool. I wonder what other weird rocks are nearby?
|
|
|
|
Post by victor1941 on Aug 7, 2019 10:13:08 GMT -5
This stone looks like quartz with some crystalline areas.
|
|
|
|
Post by rockpickerforever on Aug 7, 2019 13:53:13 GMT -5
Agree that it is quartz, not feldspar.
|
|
|
|
Post by rmf on Aug 7, 2019 19:25:29 GMT -5
It is botryoidal chalcedony on agate. any crystals, if there were any, have been worn away. As a test take a quartz Crystal or a flint arrow head and try to scratch the stone. My guess it theat they will mutually scratch each other. This proves a hardness of 7. If quartz easily scratches the go the feldspar route with botryoidal chalcedony. The botryoidal part is definately chalcedony so it is hardness of 7.
|
|
fuss
spending too much on rocks
Member since October 2018
Posts: 258
|
Post by fuss on Aug 8, 2019 11:45:28 GMT -5
I am assuming the silver/white circles in the lower center of the first photo are just reflections of the light source. If not and those are inclusions of some sort in a translucent silicate material then you could have something pretty interesting there. But to me this looks like a weathered botryoidal chert with some oxide staining. I have some very similar pieces I collected along lake Mi as well. The botryoidal form does make it a relatively uncommon find. I see no indication of it being an agate of any sort.
|
|
