The Feldspar Group
Posted by House of Gems on 16 October, 2009
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This item was filled under [ Gemstone Beads, Jewelry Articles ]
The Feldspar group of minerals (calcium, sodium, or potassium aluminum silicates) is the most abundant building block in the Earth’s crust. It is commonly found in granite, pegmatite, & other igneous rocks. Clay (shale & slate) is formed from decomposed Feldspar. Like the Garnet group, the Feldspar group, also, splits into two distinct sub-groups: The Sodium Potassium [...]