ALKALI FELDSPAR Flashcards
1
Q
alkali feldspar characteristics
A
- Colour ranges from white to light pink
- Carlsbad twins are common; they generally divide a crystal into two equal parts
- Commonly with a perthitic texture in plutonic igneous rocks; shows as parallel or lamellar intergrowth of K-rich and Na-rich feldspar in which the K-feldspar is the host
- colourless/cloudy in ppl/simple twinning in xpl
2
Q
alkali feldspar occurrence
A
one of the most common minerals in igneous rocks, where it typically occurs in acidic (felsic) rocks.
