ColoradoProspector   CP Club Membership Info.

Welcome Guest ( Log In | Register )

 
Reply to this topicStart new topic
Western Colorado Rock ID
Flapjacks
post May 10 2018, 12:31 PM
Post #1


Observer
*

Group: Members
Posts: 2
Joined: 10-May 18
Member No.: 143,583



I found this in Mesa County, associated with a mudstone formation. I don't know rocks too well, but it seems like a chert sandwich. Seems kind of familiar, like I may have seen something
like this outside of Colorado.

Anyone know for certain what this is and possibly some geological insight on such a formation?

Thanks for any help!


Attached Image

Attached Image
Go to the top of the page
 
+Quote Post
Clay Diggins
post May 14 2018, 09:03 AM
Post #2


Shovel Buster!
***

Group: Members
Posts: 107
Joined: 23-September 14
Member No.: 118,169



Hard to tell from a picture but it looks like Calcite.

Have you done streak and hardness tests?
Go to the top of the page
 
+Quote Post
Flapjacks
post May 14 2018, 12:12 PM
Post #3


Observer
*

Group: Members
Posts: 2
Joined: 10-May 18
Member No.: 143,583



QUOTE (Clay Diggins @ May 14 2018, 10:03 AM) *
Hard to tell from a picture but it looks like Calcite.

Have you done streak and hardness tests?


Probably should have done that first, huh? Scratched by glass easily and about a match for copper (stuff I have handy). Don't have a streak plate but lot of white coming off from scratching.

So yeah, calcite. Should have concluded that based on the fair amount of obvious calcite forming seams in the rock at the same site, but the look of this loose tan stuff threw me quite a bit.

Thanks!
Go to the top of the page
 
+Quote Post

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



Lo-Fi Version Time is now: 19th March 2024 - 02:06 AM