Is feldspar a quartz?

Is feldspar a quartz?

Quartz and feldspar are minerals that are found on the earth's crust. … Quartz is found in igneous, sedimentary and metamorphic rocks. Feldspar is found in granite bodies and pegmatite bodies. Quartz is harder then feldspar.

Which is harder quartz or feldspar?

Diamond is the hardest known mineral, Mohs' 10. … If a mineral cannot be scratched by a knife blade but can be scratched by quartz then its hardness is between 5 and 7 (stated as 5-7) on Mohs scale. A relative hardness value of 6.5 means that the mineral could scratch orthoclase (feldspar) but not quartz.

How does feldspar and quartz differ chemically?

Quartz is composed of silicon and oxygen. The feldspar group on the other hand, is composed of aluminum and silica ions and it also includes potassium oxide, calcium oxide, and sodium oxide.

What rock contains quartz and feldspar?

Granite is a coarse-grained, light-colored, intrusive igneous rock that contains mainly quartz, feldspar, and mica minerals. The specimen above is about two inches (five centimeters) across.