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
❓Your Mineral Identification Questions answered here
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="user 4386" data-source="post: 507006" data-attributes="member: 4386"><p>The symmetry looks wrong for beryl - looks like topaz to me. If topaz you will find many look rectangular in cross-section (unlike the hexagonal cross-sections typical of beryl). However the development of smaller faces on your crystals is also inconsistent with the hexagonal symmetry of beryl. You have an r.i. of 1.59 but topaz with topaz with high concentrations of fluorine rather than hydroxyl can be 1.61. So it is your SG of 2.8 that seems anomalous for zircon (more typical of beryl) - 3.4 to 3.6 would be usual for zircon, being highest in those with high fluorine (can reach 4.5 apparently). That is a large discrepancy - it might be worth determining it again (try also determining the SG on a clean bit of quartz at the same time, just to check that you are really getting an SG similar to quartz (which is 2.6).</p></blockquote><p></p>
[QUOTE="user 4386, post: 507006, member: 4386"] The symmetry looks wrong for beryl - looks like topaz to me. If topaz you will find many look rectangular in cross-section (unlike the hexagonal cross-sections typical of beryl). However the development of smaller faces on your crystals is also inconsistent with the hexagonal symmetry of beryl. You have an r.i. of 1.59 but topaz with topaz with high concentrations of fluorine rather than hydroxyl can be 1.61. So it is your SG of 2.8 that seems anomalous for zircon (more typical of beryl) - 3.4 to 3.6 would be usual for zircon, being highest in those with high fluorine (can reach 4.5 apparently). That is a large discrepancy - it might be worth determining it again (try also determining the SG on a clean bit of quartz at the same time, just to check that you are really getting an SG similar to quartz (which is 2.6). [/QUOTE]
Verification
Post reply
Gemstones, Minerals & Fossils
Gemstones and Minerals
❓Your Mineral Identification Questions answered here
Top