Felspar is a type of white or red rock that forms aluminum and silicate minerals from the Group of plagioclase which is used in glassmaking and the ceramics industries.
Feldspar
- Feldspars (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8) are a group of rock-forming tectosilicate minerals that make up about 41% of the Earth's continental crust by weight.Feldspars crystallize from m
Fess Parker
- Fess Elisha Parker, Jr. (born F.E. Parker; August 16, 1924 – March 18, 2010), was an American film and television actor best known for his portrayals of Davy Crockett in the Walt Disney 1954–
Some of the porphyroids which have grains of quartz and felspar in a finely schistose micaceous matrix are intermediate between porphyries and micaschists of this group. Still more numerous are orthoschists of hornblendic character (hornblende-schists) consisting of green hornblende with often fel
In the mica-schists of this group biotite or muscovite may be the principal mineral and often both are present in varying proportions; the mica has developed from the argillaceous matter of the original rock; in addition there is always quartz and sometimes felspar (albite or oligoclase).
The difference between schists and gneisses is mainly that the latter have less highly developed foliation; they also, as a rule, are more coarse grained, and contain far more quartz and felspar, two minerals which rarely assume platy or acicular forms, and hence do not lead to the production of a f
From these rocks in the Ottawa valley are quarried or mined granite, marble, magnificent blue sodalite, felspar, talc, actinolite, mica, apatite, graphite and corundum; the latter mineral, which occurs on a larger scale here than elsewhere, is rapidly replacing emery as an abrasive.
felspar הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד