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Quick Summer Quiz https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=19&t=6167 |
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Author: | Brad P [ Thu Jul 03, 2008 12:06 pm ] |
Post subject: | Quick Summer Quiz |
Hi all, Was taking some photos for the site and starting playing around with a few things. Came up with this shot and thought it may make a decent little quiz. The stones here are all of the same species. It is a doubly refractive species, harder than apatite and softer than sapphire. It is not tourmaline and the stones in the photo are from very different localities. Any guesses so far? Extra credit for naming the varieties! |
Author: | Tim [ Thu Jul 03, 2008 12:21 pm ] |
Post subject: | |
I'll have a guess: kunzite, spodumene, hiddenite |
Author: | Brad P [ Thu Jul 03, 2008 12:47 pm ] |
Post subject: | |
Good guess, but you'll have to try again! |
Author: | HME [ Thu Jul 03, 2008 3:33 pm ] |
Post subject: | |
Beryls? Morganite, aquamarine, heliodor? |
Author: | RAW rocks [ Thu Jul 03, 2008 4:48 pm ] |
Post subject: | |
Is it topaz? |
Author: | jleb [ Thu Jul 03, 2008 7:34 pm ] |
Post subject: | |
Zircon! pink tanzania Green Burma/Sri Lanka Blue cambodia/vietnam |
Author: | Brad P [ Fri Jul 04, 2008 2:54 pm ] |
Post subject: | |
Perhaps more challenging than I suspected! Ok, let's see. Softer than any of the guesses so far - though we are not talking about some obscure rarity that is a 3 or something like that, I promise. Higher RI than Beryl. |
Author: | Jason [ Fri Jul 04, 2008 3:19 pm ] |
Post subject: | |
The blue one is throwing me off. I can come up with species that come in blue and pink or blue and green or pink and green but not blue pink and green. Hmmmmmmmmmm. Have any of these stones been treated? J- |
Author: | gemlover [ Fri Jul 04, 2008 3:55 pm ] |
Post subject: | Gem Quiz |
Ok, lets do this by elimination; using mineralogy text original parameters harder than apatite (5); softer than beryl (8); double refraction then "softer than any of the guesses so far" zircon (7) hardness range >5 x <7 Blue Minerals Lazurite Riebeckite Turquoise Lazulite Sodalite Lawsonite Plagioclase (Feldspar) Glaucophane Benitoite Kyanite Vesuvianite Pink to Violet Tremolite Scapolite Rhodonite Opal Inesite Tephroite Zoisite Jadeite Spodumene (already guessed, so should be softer <6 1/2) Garnet Green Titanite Analcime Datolite Actinolite Hedenbergite Hornblende Pargasite Hypersthene Augite Diopside Scapolite Tourquoise Willemite Opal Orthoclase Pumpellyte Acmite Prehnite Zoisite Kyanite Epidote Vesuvianite Jadeite Spodumene Olivine Garnet No matches with pink/violet except spodumene which has already been eliminated. Matches with blue and green: Turquoise (definitely not this) Kyanite Vesuvianite Feldspar (Plagioclase and Orthoclase) I give up. John |
Author: | Brad P [ Fri Jul 04, 2008 9:42 pm ] |
Post subject: | |
Jason, none have been treated. In fact, I have never heard of any treatment done to this species. John, all I can say is that there seems to be an omission in the pink/violet list from the text you've used. |
Author: | Frank [ Sat Jul 05, 2008 4:44 pm ] |
Post subject: | |
Hi Brad, I guess they are all feldspars, of one variety or another (Though if recent debate is anything to go by then at least some of these may be treated...so maybe not) I don't think I'm being very decisive here. Frank |
Author: | Barbra Voltaire, FGG [ Sun Jul 06, 2008 1:13 am ] |
Post subject: | |
Scapolite can occur in those colors. |
Author: | valeria102 [ Sun Jul 06, 2008 5:12 am ] |
Post subject: | |
So far, the you gave mentions: - doubly refractive - hardness between apatite and zircon - RI above beryl (how hard is that!) - those colors clearly, the academic ID method would be to work through that list of probabilistic possibilities, but that sounds more like writing a boring book then answering a little Sunday quiz. And ya' never know... Chrysoberyl I'd say. Right |
Author: | Facetor [ Sun Jul 06, 2008 9:33 am ] |
Post subject: | |
Then it must be Vesuvianite , though the blue doesn't seem to fit as per any info I can find. Zoisite is another strong possibility except that you say it's not a treated material and tanzanite is usually treated. If it's Vesuvianite , I can't find any mention of color based names, such as with Kunzite, so that spec isn't met. |
Author: | Barbra Voltaire, FGG [ Sun Jul 06, 2008 12:00 pm ] |
Post subject: | |
I think we need more clues. Just goes to show you, they could be several things, all impossible to identify without proper test results. |
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