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Rockhound Times

Your one-stop shop for rock and geology news, collecting sites, and essential rockhounding equipment.
Welcome to Rockhound Times, where you can browse through dozens of detailed gem and fossil collecting localities, find recent news of interest to the rockhounding and geology communities, and even stock up on the essential books and gear that any well-equipped rockhound should have.

We believe that rockhounding should be a hobby that is open to all, and with that in mind, we've set out to share the rock and gem collecting sites with the world. From tiny roadside stops to major, well-known collecting sites, you can find it at Rockhound Times.

Happy hunting!

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Mineral of the Day: Actinolite

1/19/2016

1 Comment

 
PictureAn exceptionally gemmy actinolite specimen from Mendocino County

​ Here in Northern California, one of the more common collectible stones around is Actinolite. I've always had a soft spot for this mineral, ever since I was a child.

The name "actinolite" comes from the Greek word aktis, meaning "ray" - a reference to the appearance of the crystals.

It is a softer, more fibrous relation to Nephrite Jade, and can commonly be found in regions that have jade or serpentine. The crystals are usually green, ranging from pale green to nearly black - the coloration is determined by the amount of iron the specimen contains. More iron causes darker colors.

PictureA more typical actinolite sample
​In Mendocino County, California, actinolite can commonly be found in most rivers and creeks. The crystals will be worn smooth, but usually when you break them open, lovely bladed crystals will be exposed. When the sun is out, it can be easy to spot the specimens because of the way the sunlight reflects off each fibrous crystal blade - the rock seems to sparkle.

Translucent actinolite is rare, but can be faceted into gemstones if found in a sufficient quality.

Picture
Actinolite with large crystal, from Washington State.
1 Comment
Stacy Warner link
1/3/2021 02:33:46 am

I eenjoyed reading this

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