Snowflake obsidian is a form of volcanic glass that features white or grayish “snowflake” shapes made of embedded ...

Obsidian is perhaps best known in its role as the dark black blade atop ancient ... is that it gradually loses its glassy appearance, instead becoming more rock-like.

Looking at an igneous rock, such as the granite along Stockton Hill Road at milepost 10, you’ll see a variety of minerals.