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Rocks In My Head

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geology et al
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Rock Shop
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Posted by oh5/ojhoff at 7:21 PM CST
Updated: 02/17/13 5:16 PM CST
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Posted by oh5/ojhoff at 7:17 PM CST
Updated: 02/17/13 5:15 PM CST
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Posted by oh5/ojhoff at 7:02 PM CST
Updated: 02/17/13 5:14 PM CST
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Benedicta’s Moonstone 




Posted by oh5/ojhoff at 6:55 PM CST
Updated: 02/17/13 5:12 PM CST
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Posted by oh5/ojhoff at 6:43 PM CST
Updated: 02/17/13 5:10 PM CST
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Posted by oh5/ojhoff at 4:21 PM CST
Updated: 02/17/13 5:05 PM CST
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Posted by oh5/ojhoff at 4:58 PM CST
Updated: 12/29/12 5:00 PM CST
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Posted by oh5/ojhoff at 10:11 AM CST
Updated: 12/05/12 10:13 AM CST
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Life in Helga Township

 These pics show citizens' reactions to the ruling (and a lawsuit) that says you can't sell rocks off your property in Helga Township (Hubbard County, MN).  My own reaction was to post a Genuine Helga Township Field Rock For Sale notice on my Facebook.

Posted by oh5/ojhoff at 12:54 PM CST
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Quartz Crystal

Quartz Crystal 




Video I made about rock crystal (semi-steampunk). 

Posted by oh5/ojhoff at 2:12 PM CDT
Updated: 02/17/13 4:30 PM CST
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According to the book I have resumed reading, Minnesota Geology, the Cenozoic was the era when Minnesota began  to achieve its status as the “icebox  of the nation”.   The Rocky Mountains had formed, changing the climate.  Dinosaurs had disappeared and small mammals predominated.  Remains are found in the Badlands of South Dakota which  unfortunately are not found  in Minnesota.  Glacial drift covers evidence of activity.   Of course, subsurface exploration may one day reveal some of the specifics. 



Posted by oh5/ojhoff at 2:15 PM CDT
Updated: 09/20/12 2:21 PM CDT
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 I haven't done much with my rock business this summer.  I was flea-bitten (or something) and I didn't print up new business cards as planned, or place ads in the local shopper.  I did, however, sell a couple of articles on birthstones and I made a handful of infomercials in the virtual world called SecondLife.  Those were fun to do!  I also acquired inventory through purchase and trade.  I chose stones with an eye to jewelry making next winter.  And the trade was great!  Also, I now market Thunder Bay amethyst. 



Posted by oh5/ojhoff at 4:53 PM CDT
Updated: 08/15/12 5:03 PM CDT
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things not to say to the sole proprietor of a rock shop


Some day, when I have time, I’m going to take up a fun hobby like this.  Maybe after I retire.

Allow me to throw a bucket of cold water on your  life too.


Do you polish your own rocks or do you just buy and resell?

I have all the equipment to do the processes  but there wouldn’t be enough hours in a day to create this much inventory.  Not that it’s any of your  business.


Do you find all of these rocks around here?

Sure.  We live in an area that abounds in precious metal ores, azurite and malachite, aquarmarine, rubies, emeralds.  Just dig right in.


I should stop in and take a look at your rocks.

I’ve been here for decades.  Why bother now?


I’m bringing the kids over to look at rocks.  Kids just LOVE rocks.

This isn’t a toy store.


Do you have a rock polisher?

Yes  I’ve got an all-in-one machine that tumbles, makes cabochons, facets and does the whole operation.  You just press a few buttons and let ‘er rip.


Are these rocks basically what was left over from your grandfather’s business?

Are you a rude SOB who never learned any manners?


What is this specimen?

It’s an ugly gray rock.  Why do you want to know?


Do you buy rocks?

Leave your number.  If I want your damn rocks, I’ll call you.


My uncle used to polish rocks.

Bless him.


Where do you get all these rocks?

I pick them off from trees.


Have you been to Duluth?  They have a nice BIG rock shop over there.

F*** you.



Posted by oh5/ojhoff at 7:16 PM CDT
Updated: 06/14/12 7:21 PM CDT
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One of my grandfather's old customers stopped in to see me.  He brought soapstone.  Of course, my immediate question was, what should I do with this?
 The scientific name for soapstone is steatite.  It is composed mainly of talc, which gives it a "soapy" feel.  Soapstone has been used for aeons and in many cultures.  In fact, it is still a favorite carving medium.  Some of its uses are architectural features, counter tops, coasters, "surrounds" for stoves, sinks, tombstones, ceremonial carvings, bowls, goblets, cooking pots, boxes, vases, paving stones...  If I want to make something, I have a lot of choices.
I just realized that an object I have owned for years is most likely soapstone.  It is a scarab amulet, dyed and glazed, in the Egyptian style.  



Posted by oh5/ojhoff at 8:21 AM CDT
Updated: 06/01/12 8:47 AM CDT
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The Diamond Trade 



Posted by oh5/ojhoff at 8:01 AM CDT
Updated: 05/09/12 8:19 AM CDT
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A story about bloodstone, the alternate birthstone for March

The Bloodstone Tale 



Posted by oh5/ojhoff at 7:55 AM CDT
Updated: 05/09/12 8:20 AM CDT
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A poem about March's birthstone, the aquamarine



Posted by oh5/ojhoff at 7:56 AM CDT
Updated: 05/09/12 8:21 AM CDT
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Jurassic and Cretaceous in MN

TThe Jurassic period of the Mesozoic left discoverable rocks in NW Minnesota, known as the Hallock red beds.  They are known from drill holes and do not contain fossils.  Nearby evaporites in ND and Manitoba suggest that the climate was hot and semi-arid.  It is likely that dinosaurs wandered across Minnesota but no remains have been found.


The Jurassic was followed by the Cretaceous when the seas advanced upon North America.  The eastern shore of this Cretaceous sea was located in part of MN.  Sediment deposited in this sea was mostly siltstone.  Conglomerates made up of hematite pebbles are found, which indicates that the hematite must have been formed quite some time before it was weathered and broken up.  The entire world most likely experienced warm climate.

Some coal has been found in Minnesota from this time, made up of conifers.  It is likely the landscape was swampy.  Weathered granites and gneises have left behind kaolinite, which is used in ceramics.

Dinosaur remains in Minnesota may lie under glacial drift.  A few cretaceous fossils have been found, including a marine crocodile, sharks teeth, ammonites and snails.  Also the variety of plants include flowers, ferns, conifers and deciduous trees. 


Posted by oh5/ojhoff at 10:35 AM CDT
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Black Onyx
A video made in a virtual world called Second Life, about the alternative birthstone for February, the black onyx.



A Black Onyx Gothic

Posted by oh5/ojhoff at 10:20 AM CDT
Updated: 04/04/12 10:30 AM CDT
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Here is a video I produced in the virtual world Second Life, about the amethyst, the birthstone for February  



Amethyst Mystery 

Posted by oh5/ojhoff at 8:56 AM CDT
Updated: 04/04/12 10:33 AM CDT
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