Hard Rock Quarry

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Rock Projects (1)

Here are some before and after pictures of the rocks that we have worked in the School of Hard Rocks.  These rocks are all from The Rock Shed in Keystone, South Dakota.  They have been a lot of fun to process and even more fun to share.  Where it makes sense, you can see some "inprocess photos".  Enjoy.


Carnelian Agate

5 pounds of Carnelian agate
Carnelian Agate Photo
Carnelian Agate Close Up

Blue Grey Agate

5 pounds of Blue Grey agate
Blue Gray Agate
Blue Gray Agate Close Up

Spotted Sodalite

5 pounds of Spotted Sodalite
Spotted Blue Sodalite
Spotted Blue Sodalite Close Up


5 pounds of Moonstone
Moonstone Close Up

Mixed Rock

10 pounds mixed rock - 3/4 to 1 1/2 inches
Mixed Rock Finished
Mixed Rock Close Up

Tiger Eye

5 pounds of Tiger Eye
Tiger Eye
Tiger Eye Close Up

Changing the scale of the project - or - why I love my B1A1 tumbler.

I was able to combine all the rocks from my spring projects into a single batch in the B1A1 rock tumbler.  Here is what they look like after 264 hours of grinding.  I added in some pieces of rose quartz and some other rocks for my study on grind rate.  I'll tell you now, I am seeing 4% reduction in weight per day of grinding.  That is with either 90 grit or 220 grit abrasive.

Spring Project Rocks: June 3rd, 2009

I started tumbling 30 pounds of agate from Brazil today.  These are nice big pieces and it will test my patience to wait for them to grind and polish.  Charles Dickens would be proud - as you can see in the photo below, I have "Great Expectations".

Agate from Brazil

30 pounds of Brazilian Agate
Most of the Brazilian agates are still in process.  A few of the smaller ones are finished.  They look a lot like chocolate.

Brazilian Agates

Here are the agates after one grinding cycle.  I really like the colors and the patterns that are emerging.

More fun than a "noche de soltero".

Brazilian Agates after one grind cycle. Baile hot.