Message Index Start New Topic Photo Gallery FAQ and Use Tips Bob's Rock Shop


Hello, all,
I have been looking for these in the house for awhile.. they exhibit classic agate banding patterns, but the material they are made of is DEFINITELY not siliceous!

Handling them leaves a white, talc-like residue on my hands, and they quickly absorb any water thats dropped on their surface.. Due to this "sponge" action, I hav'nt got much effervescence from vinegar. (Will detach a small piece and put some stronger acid on it).
I have always been told that agate formation came about due to the intermittent flows of hydrothermal silica solutions into spaces in a solid or semi-solid lava flow, building up the typical agate layers (like a tree's growth rings). But this is something else... maybe the agates "rings" are pre-formed" out of a carbonate material, and then replaced by the hydrothermal silica. ??? Any comments??

There is a gentleman at Stanford nicknamed "The Agateer", who I would love to comment on this...but he's a difficult man to reach.. ( Prof, I Hope you see this !!)

P.S. See the pictures submitted at the same date in the "photo" section..

From tony goffe - November 21, 2012 at 01:40:24

Message: 70538

Message Reply Form

Use the form below to post a reply to the Non-siliceous message. If you haven't read the Rock Net FAQ and User Tips yet, now would be a good time to do so.

Your Name: (Required)
E-Mail Address: (Optional)
Subject: Re: Non-siliceous
Reply Message: (Required)
Last chance to check your message for typos!

Message Index Start New Topic Photo Gallery FAQ and Use Tips Bob's Rock Shop

Browse Our Online Gallery of Wilensky Quality Minerals - Order Our Video Catalog!

Bob Keller