Mohs Hardness 5-9 Pencils Mineral Identification Scratch Test Scale

US $79.99

ShenZhen, China
Mar 6th

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Mohs Hardness 5-9 Pencils Mineral Identification Scratch Test Scale Hardness Scale:5-9 For testing the hardness scale of minerals Other hardness scale available Hardness pencils are pencils with a tip made of one of the 10 minerals on Mohs scale.These pencils are used to try and scratch a stone and observe if the pencils can scratch the gem. Since this is a destructive method (it leaves a scratch), this test is mostly used on pieces of rough or on a inconspicuous place on the gemstone. Not many gemologists use this test as there are better ways to determine a gemstone's identity. When one does feel the need to apply this test, one must do it in a logical manner. The gemstone is tested with a pencil of low hardness (starting at 4 or lower) to try to put a tiny scratch on the stone without applying pressure. If no scratch is observed, one repeats this process with a pencil of higher hardness (in this case 5) and so on until one arrives at the pencil that is able to put a tiny scratch on the stone. For instance, if one could not scratch the mineral with pencil no.7 but it would leave a scratch with pencil no.8, the hardness of the mineral must be between 7 and 8 on Mohs scale. Mohs Hardness:5-9 The Hardness Pencil:qpatite-5; orthoclase-6; quarta-7; topaz-8; corundum-9 , Those minerals are mounted in five metal pole respectively,use the corner of those mineral to scratch the gem,you will get the hardness according to the nick you scratch, If there is a nick after you scratched, the sample's hardness is lower than the standard hardness pencil; If there is no nick after you scratched, that means the sample's hardness is higher than the standard hardness pencil. Package contents: 5pcs of Hardness pencils:5-9 NOTE: 1.NO English user instructions available. 2.Made in China We ONLY accept PayPal as the payment method. We will ship the item out after the payment is clear if you pay the payment with paypal echeck. Items unpaid after 4 days will be subject to an unpaid item dispute. We ship worldwide Except China,Hong Kong,Italy,Belgium,France, Germany,Africa, Mexico. Estimated delivery time under normal condition as below,please ignore the estimated period by ebay system which may not be correct: A: 14-35 business days to USA /Canada/ Australia / United Kingdom B: 3-8 weeks to some European countries as Malta, Latvia, Spain, Italy, Russia, and Brazil, etc., due to strict customs inspection. C: 20-45 business days to most countries except A and B. If you don't receive items over 35 business days, please notify us. You are required to pay $15 to $35 in addition if you want us to ship items via EMS/UPS/DHL depending on the destination. inkfrog terapeak i000000 inkFrog Analytics On Mar-05-15 at 05:51:20 PST, seller added the following information:

“new in box. User manual in Chinese”