Felspar Group
in mineralogy, a group of unisilicates; its composition having the protoxide bases lime, soda , potash, and, in one species, baryta, the sesquioxide only alumina; ratio between the two 1.3. Dana includes under it the species Anorthite (Lime felspar), Labradorite (Lime-soda felspar), Hyalophane (Baryta-potash felspar), Andesite and Oligoclase (Soda-lime felspar), Albite (Soda-lime felspar), and Orthoclase (Potash felspar).
Blue felspar, the same as lazulite; common felspar, the same as orthoclase; compact felspar, the same as felsite. It is either compact massive oligoclase, oligoclase felsite, or compact orthoclase, orthoclase felsite, halleflinta. Glassy felspar, the same as sanidine; Labrador felspar, the same as labradorite; lime felspar, the same as indianite, or as labradorite; potash felspar, the same as orthoclase. The name was used specially to distinguish it from albite (soda felspar). Soda felspar, the same as albite.
FEMGERICHTE