Definition of Oligoclase. Meaning of Oligoclase. Synonyms of Oligoclase

- Oligoclase is a rock-forming mineral belonging to the plagioclase feldspars. In chemical composition and in its crystallographic and physical characters...
- Sunstone is a microcline or oligoclase feldspar, which when viewed from certain directions exhibits a spangled appearance. It has been found in Southern...
- Gotthard.[better source needed] A solid solution of the plagioclase feldspar oligoclase +/− the pot****ium feldspar orthoclase also produces moonstone specimens...
- silica and related volcanics such as andesite. Oligoclase is common in granite and monzonite. The name oligoclase is derived from the Gr**** olígos ('small,...
- Osumilite Otavite Ottrelite Otwayite Varieties that are not valid species: Oligoclase (a mixture of albite and anorthite) Onyx (a monochromatic banded variety...
- (/ˈmʌɡiəraɪt/) is a type of oligoclase-bearing basalt, comprising olivine, apatite, and opaque oxides. The main feldspar in mugearite is oligoclase. Mugearite is a...
- follows (with percent anorthite in parentheses): albite (0 to 10) NaAlSi3O8 oligoclase (10 to 30) (Na,Ca)(Al,Si)AlSi2O8 andesine (30 to 50) NaAlSi 3O 8 – CaAl...
- an element of the ground-m****. The plagioclase in dacite ranges from oligoclase to andesine and labradorite. Sanidine occurs, although in small proportions...
- sometimes are present as phenocrysts. The plagioclase is usually sodium-rich (oligoclase or andesine). Cristobalite and trydimite are sometimes present along with...
- plagioclase is typically intermediate to sodic in composition, andesine to oligoclase. Quartz is present in significant amounts. Biotite and/or hornblende constitute...