Haystack Quartz from the Jeffrey Quarry in Arkansas. This is the same quarry from where we get Solution Quartz and Haystack Quartz is just a type of Solution Quartz.

this Quartz grows in Rectorite which is named after a lawyer that lived in Hot Springs, Arkansas. It is a jelly when in the rock fractures and the quartz grows in this jelly. That is why every crystal is double terminated unless it grew on the sandstone. When you dig the quartz out of the fractures and the rectorite hits the air it turns to what is called "Mountain Leather". It's really cool stuff but its texture and plyability reminds me more of a dried mushroom than of leather.

Rectorite is a clay mineral with a 1:1 regular interstratification of a dioctahedral Mica and a dioctahedral Smectite.