5 on the Mohs scale

Weight:  17-23 grams / 0

The pseudomorphs occur within the Cretaceous Khoman Chalk

Ruby is the second hardest stone after diamond so few artists have managed to successfully work this mineral since it requires a very advanced technique for carving and polishing

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Libyan Desert Glass | Natural Impact Glass | 5 Grams | Authentic Impactite Chondrite 5 on the Mohs scaleThis is a rare and fantastic 5 gram Libyan Desert Glass from Kuffra, Libya, with dimensions of 28x16x13 mm. Although its exact origin is still debated, the leading theory suggests it was formed by a high energy event, such as a meteoric impact or airburst, that melted the desert sand directly where it lay, without being ejected into the atmosphere and re entering. This results in different physical characteristics compared to tektites. Libyan Desert