List of top Geology Questions on Mineralogy

The figure shows variation in optical properties of plagioclase feldspars with composition. A feldspar from a lunar anorthosite, with anorthite mole % of 85, will have a birefringence of ........ (Round off to three decimal places) 
 

A metallic mineral weighs 44 g and displaces 11 mL of water when fully immersed. The density of the mineral is ......... g/cc. (In integer)
Which one of the following mineral associations is diagnostic of the highly-oxidized zone of a weathered primary base metal vein?
Match the minerals in Column 1 to their characteristic optical properties in Column 2.
A halide with octahedral cleavage can scratch calcite and can be scratched by quartz. Identify the halide.
Which one of the following minerals does NOT show changes in optical properties upon exposure to UV light?