The feldspar content ranges from oligoclase to andesite and labradorite, and is often very zonal; sanidine occurs also in some dacites, and when abundant gives rise to rocks that form transitions to the rhyolites.
Sanidine occurs also in some dacites, and when abundant gives rise to rocks that form transitions to the rhyolites. The feldspar content ranges from oligoclase to andesite and labradorite, and is often very zoned.
The feldspar content ranges from oligoclase to andesite and labradorite, and is often very zoned. Sanidine occurs also in some dacites, and when abundant gives rise to rocks that form transitions to the rhyolites.
The feldspar content ranges from oligoclase to andesite and labradorite, and is often very zoned. Sanidine occurs also in some dacites, and when abundant gives rise to rocks that form transitions to the rhyolites.