Mineral necessarily constant for all sides, which is a function of its structure; crystallographic weakness renders some directions softer than others. An example of this property exists in kyanite, which has a Mohs hardness of 5½ parallel to [001] but 7 parallel to [100]. The most common scale of measurement is the ordinal Mohs hardness scale. Defined by ten indicators, a mineral with a higher index scratches those below it. The scale ranges from talc, a phyllosilicate, to diamond, a carbon polymorph that is the hardest natural material. The scale is provided below: Lustre indicates how light reflects from the mineral's
Geo-Mineral Exploration Corporation Geo-Mineral Exploration Corporation Geo-Mineral Exploration Corporation is an environmentally-sensitive exploration, acquisition, and merger company, which examines the viability of consolidating historic underground mining properties into small-scale specialty production alliances. The Geo-Mineral Corporation and its independent affiliates, are fully American-owned and operated. The Geo-Mineral Exploration Corporation was formed in 1968, as a limited partnership of twelve mining-industry professionals. In 1969, with claims to three properties in hand, the Geo-Mineral partnership converted all shares to simple, and preferred stock certificates, as the board unanimously voted to change its structure into that of a Corporation. Geo-Mineral Exploration Corporation (also known as Geo, Geomineral,