Inner Mongolian quartz cluster with calcite Stalactitic chalcedony with small pyrite crystals sprinkled

with small pyrite crystals sprinkled throughout

It would be more accurately called a peridotite xenolith in basalt

This material from Santa Eulalia has rhombohedral calcite crystals on a red-brown iron-oxide matrix

The white is a small amount of calcite

you can see they are hollow inside

Inner Mongolian quartz cluster with calcite Stalactitic chalcedony with small pyrite crystals sprinkledLocale: HuangGangLiang mining district, Inner Mongolia, China Approx point length: 4" Approx weight: 74g These quartz points are from HuangGangLiang, and commonly called Mongolian or Inner Mongolian quartz. This isn't your typically shiny quartz; this quartz is completely coated in a white crust and clumpy mineral growth. On one side, the piece displays a long well formed quartz point with a cluster of additional points and minerals attached. Cracks