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Microcline
A watch glass
microcline is the answer
quartz
Borax
borax
phosphate
Microcline
A watch glass
A fixed capacitor used in electronic equipment.
Feldspar
Feldspar
One can purchase electronic testing equipment online at Test Equipment Depot, Amtronix and Grainger. One can also buy used electronic testing equipment from Sphere in Canada.
phosphate
It is a mineral which can be pressed and used instead of glass.
quartz
microcline is the answer