Rough kyanite bladed crystals in a wide variety of sizes.Kyanite is unusual because it has a different hardness within the same crystal. When tested lengthways it grades between 4.5 to 6 on Mohs scale of mineral hardness. When tested across the width it's 6 to 7.This characteristic along with the fact it's also very brittle makes kyanite difficult to cut.Rough kyanite is widely used in industry primarily because of its ability to resist heat.The price stated is for 50 grams of rough untreated kyanite crystals. With each piece being a different weight it's difficult to say exactly how many that includes. Both groups of kyanite in our last photo weighs 50 grams.
Quick reference to prices with Royal Mail for standard delivery within the United Kingdom. Free postage on orders over £75.Signed For, Special Delivery and services with Hermes are also available. We post worldwide. Please refer to our Postage and Delivery page for full details.Should you be charged more for postage than we end up paying, any difference over £0.80 will be refunded.Reducing our impact on the environment is important to us. Please read our reuse and recycle policy which talks about packaging used for orders.
35.3 x 25 x 2.5
45 x 35 x 16
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