my finds from the weld river.

Tasmanian Gemstone and mineral specimen Prospecting

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loverr01
Posts: 18
Joined: Thu Jan 29, 2015 9:20 pm

my finds from the weld river.

Post by loverr01 » Mon Feb 16, 2015 8:23 pm

this is from 2 day trips down to the weld river.

can some one help me and tell me what weld 3 png is?
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Philski
Posts: 513
Joined: Tue Sep 25, 2012 2:21 pm
Location: Sheffield Tasmania
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Re: my finds from the weld river.

Post by Philski » Sun Feb 22, 2015 1:40 pm

HI

At a guess No:3 is an orange sapphire. if you have an glazed section of porcelain plate you could do a streak test. the hardness of 9 against 6.5 will groove the plate. Tasmanian Topaz is very close to the hardness of sapphire so may not be the best first identifier. it wont leave a streak only dust up the ceramic

a few other ways to identify it. I used colour and fracture.
Fractured topaz is Subconchoidal. Sapphire conchoidal

The specimen you have shows conchoidal fracture
Colour can be very similar in both stones.

Hardness 9 sapphire and 8 topaz (however Tasmanian Topaz (killiecrankie) is the hardest known topaz in the world.
S.G 4 sapphire 3.5 topaz

MINERAL: Corundum
CHEMISTRY: Al2O3
COLOR: Every color but red
REFRACTIVE INDEX: 1.762 to 1.770
BIREFRINGENCE: 0.008 to 0.010
SPECIFIC GRAVITY: 4.00
MOHS HARDNESS: 9

see if it sinks when suspended in methylene iodide
or do a refractive index on it.

Burbury or Miguel would know straight away what it is. both have spent way more time there than me. im only presuming its sapphire. Without seeing it in hand.

loverr01
Posts: 18
Joined: Thu Jan 29, 2015 9:20 pm

Re: my finds from the weld river.

Post by loverr01 » Sun Feb 22, 2015 5:20 pm

Thanks very much Phill :D

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