The minerals that make up Gneiss are almost always: feldspars, quartz, and mica. Sometimes: kyanite, garnet, hornblende, tourmaline, magnetite, and many others.
Source: Geology University Student
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Never say never, but it's mica.
Quartz rocks are worth money i sold one to a dealer he gave me 35$$.
Scientist identify minerals by Their Special properties. An example of a special propertie is a Chemical Reaction .
Yes. The grain texture also matters. For example, basalt and gabbro have the same mineral composition, but basalt, which forms on the surface, has microscopic grains while gabbro, which forms underground, has larger mineral grains.
Gabbro is made of these minerals. The proportions can vary.