Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Registered members
Current visitors
Charts
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Gemstones, Minerals & Fossils
Gemstones and Minerals
unknown find from slatey
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support Prospecting Australia:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="fossickeract" data-source="post: 288668" data-attributes="member: 3672"><p>These volcanic events may be thought of as elevators and whatever the lava comes through may determine what minerals they bring up. Chudley Park, Moonstone Hill are similar peridot bombs, feldspar bombs, spinel, sapphires and zircons. The heated silica rich waters may deposit quartz veins with copper minerals or gold or silicify to produce jaspers, chalcedony etc. Depends what they come up through and two eruptions only km apart may have come through quite different rocks. Grabben Gullen near Crookwell produces blue, green and yellow sapphires but 30 km south at Tumbarumba the lavas have intersected chrome rich serpentinite resulting in pink and red rubies.</p><p> The silicified rhyolite pictured is great cabbing material and has been carved overseas. There are ancient( Devonian) rhyolites, iron rich thus the red colour and usually quite porous, on the NSW far south coast and near Pambula they have been silicified to resemble a banded jasper.</p></blockquote><p></p>
[QUOTE="fossickeract, post: 288668, member: 3672"] These volcanic events may be thought of as elevators and whatever the lava comes through may determine what minerals they bring up. Chudley Park, Moonstone Hill are similar peridot bombs, feldspar bombs, spinel, sapphires and zircons. The heated silica rich waters may deposit quartz veins with copper minerals or gold or silicify to produce jaspers, chalcedony etc. Depends what they come up through and two eruptions only km apart may have come through quite different rocks. Grabben Gullen near Crookwell produces blue, green and yellow sapphires but 30 km south at Tumbarumba the lavas have intersected chrome rich serpentinite resulting in pink and red rubies. The silicified rhyolite pictured is great cabbing material and has been carved overseas. There are ancient( Devonian) rhyolites, iron rich thus the red colour and usually quite porous, on the NSW far south coast and near Pambula they have been silicified to resemble a banded jasper. [/QUOTE]
Verification
Post reply
Gemstones, Minerals & Fossils
Gemstones and Minerals
unknown find from slatey
Top