What is the capacitance of two square parallel plates 6.5 cm on a side that are separated by 2.0 mm of quartz?
This is a geology question rather than a botany question. Apatite is 5 on the Moh's Hardness Scale and Quartz is 7 on the scale. So, the mineral's hardness could be anything from 5 - 7. If you tested the unknown mineral against Orthoclase Feldspar (6 on the scale), you could narrow down the range somewhat.
