Ageologist finds a mineral sample alongside a swift-flowing river. she determines that the mineral is a type of quartz. what is true about this mineral?

Quartz is the second most abundant mineral on Earth's continental crust, it can be colourless to black and has the lowest weathering potential in the Goldich dissolution series and therefore it is commonly found as a residual mineral in river sediments and residual soil.

Cr(oh)3 -> cr(3+) + 3oh-