Lapidaryforum.net

Let's Rock => Identifications of Materials => Topic started by: Talusman on November 30, 2016, 09:45:14 AM

Title: Jade slab?
Post by: Talusman on November 30, 2016, 09:45:14 AM

First thought from the colors was jadeite, but specific gravity doesn't agree.

SG=3
Hardness between glass and Quartz

Does nephrite come in these colors?

Title: Re: Jade slab?
Post by: Enchantra on November 30, 2016, 11:58:10 AM

At first I was thinking this was Quartzite with some manganese, chrome, or iron bearing mineral inclusions.
Then I saw the second picture...
Looks a lot like the Sillimanite that Lloyd is finding in BC. 

Title: Re: Jade slab?
Post by: southerly on December 21, 2016, 03:10:49 AM

Not nephrite. Looks like a metamorphic mix though. My guess would be idocrase, but Enchantra may be on the money.

David

Title: Re: Jade slab?
Post by: bobby1 on December 21, 2016, 11:37:22 AM

Looks similar to Feather River Jade (Grossular Garnet) from the Feather River in Central California.
Bob