Thursday, December 31, 2020

Nature Restocked The Crater's East Drain With Diamonds After Hurricane L...


As this was written ahead of time, I hope that readers have reached 2020 New Year's Eve with some semblance of health and sanity.  And I hope that you have gotten something out of my Fall 2020 repeated visitations of "all things related to Arkansas diamonds".  This is an example of some advance-homework being beneficial.

An advisory for visitors of online video sites, unfortunately, there are a large number of "self-important commentators" filled with half-truths and "urban legends" as to how diamonds are formed, e.g., from the heating and intense compression of coal.  Apparently, they haven't taken the time to study the subject with the wealth of online resources and take notes to improve retention.  

Sometimes I try to gently steer conversational threads towards a greater accuracy, but some folks have forgotten the important elements of polite conversation and the civil exchange of information.  In other words, perhaps they haven't read any Dale Carnegie lately and some folks don't take advice and suggestions well.  

I guess behind the seeming-anonymity of a computer keyboard or keypad, they develop a false bravado.  And personally, I don't care about the complex politics and marketing of diamonds amidst the "diamond cartels" of the world.  The search for Arkansas diamonds should be informative and fun.

The Crater of Diamonds is a truly unique place and experience worldwide, where common citizens pay a nominal $10 entrance fee and then keep anything they find.  With the advent of video-sharing sites, the park may experience high volumes of visitors during certain times of the year and you might need to order tickets ahead of time.

Don't go there expecting to "hit it rich" the first time and finding a diamond on the first visit is probably an uncommon event.  If you are lucky, some of the "regulars" might be willing to offer some advice on "where to look and what to look for".  As shown in some of the videos, hopefully, the park staff (rangers) will do the same.  As you are outside, away from the noise of TV, radio, and the computer screen, it can be a place of relaxation if done properly. 

And I would advise any aging Baby Boomers to take it easy, hydrate, and go during times of the year with moderated temperatures (preferably after a heavy rain).

Saturday, December 26, 2020

The Hornsby Volcano - Maar Volcanoes and Diatremes


[Hope things have settled a bit for you, from this wild, wild year.]

After posting scads of Arkansas Diamond-related videos, perhaps it's time to look at Diatremes (the "host rock") and their sometimes-companion Maar Volcanoes.  The host rock for the Crater of Diamonds Park is termed by some as the Prairie Lake Diatreme.  

It seems there aren't many such videos, at least that I have found.  The above video is from Australia.  At about 1:50 in the above video is the discussion of the Maar-Diatreme "combo" for this particular locality.  In another Australian video, the narrator describes Maar-Diatreme combos beginning at about 1:45.  

A U.S. National Park Service post about Maar-Diatreme combos is here.  In the heavily-eroded Navajo Volcanic Field in NE Arizona and adjacent NW New Mexico, there are some occurrences of maars and diatremes, including the Buell Park Diatreme in Apache County, AZ northwest of Gallup, New Mexico.

A maar is a low-relief crater caused by a phreatomagmatic eruption. This is a situation where groundwater comes in contact with lava or magma and the resulting steam causes an explosion. This digs out a hole in the ground, creating the maar crater. And then, it usually fills back in to create a lake.

Kilbourne Hole is one of several volcanic maars located in Doña Ana County, New Mexico. Volcanic maars are unusual volcanic features, and Kilbourne is probably the best example to be seen anywhere in the world. Maars look something like meteor impact craters, but they are formed by other processes.

The theory of maar formation is that rising magma super-heats water-saturated earth (as with an aquifer), far enough below the surface that the high pressure can be contained.  At some point, the pressure is too much, and a steam explosion occurs, throwing the earth out in a catastrophic event.  Country rocks are fragmented and expelled in the atmosphere (together with fragments of the magma), in phreatic explosions that  - among those observed - last weeks to months before the eruptive energy subsides.

Figure 1.
Figure 2.
Figure 3.
Figure 4.

Kilbourne Hole is roughly elliptical in shape and is known as a Maar — a pit or depression caused by a volcanic explosion with little material emitted except volcanic gas. The crater is between 24,000 and 100,000 years old, and measures 1.7 miles long by well over a mile across, and is hundreds of feet deep.

In Rio Grande Rift references, other maars have been mentioned, but those await coverage at another time.

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Vermillion Point Rock Hunt 2020

Friday, December 25, 2020

Big Diamonds Being Found At The Diamond Mine!!


Merry Christmas, y'all.  Hope you have managed to make it through this crazy year.  If you plan to go diamond mining next year (for the first time), spend some time doing preparatory work.

Perhaps tomorrow (or the next day) I will change the tone just a little to look at the geology of Diatremes and their sometimes companions, Maars.

Tuesday, December 15, 2020

A Large, Beautiful, Valuable, Flawless Diamond from Arkansas' Crater of Diamonds


To distract from the cacophonous political madness of late 2020, my "Arkansas diamond video binge" continues.  As a reminder of the uniqueness of the Crater of Diamonds State Park, near Murfreesboro, is the only diamond source worldwide open to the public.  After you pay the $10 daily fee, anything you find is yours.

If you find yourself planning a trip, some preparatory "homework" is highly encouraged.

Monday, December 14, 2020

Unakite and Epidote - Rocks in a Box 1


Unakite is one of my favorite rocks.  I like the color-contrasts between the component minerals, primarily the pistachio-green Epidote and the coral-pink Potassium Feldspar.  Any gray specks present are probably Quartz.  

Amongst those into Metaphysics, sometimes "Jasper" is used in conjunction with Unakite (touted for its healing properties), but it ain't Jasper (which is a reddish cryptocrystalline Quartz).  Unakite is a hydrothermally-metamorphosed Granite (or Granitic Gneiss) and its name is derived from the Unaka Mountains straddling the state line between Tennessee and North Carolina.  

In this particular video, the Unakite comes from the shores of Lake Superior and I have seen it referenced from Lake Huron, also.  In these places, the Unakite is derived from glacial sediments, "brought down" from Canada.  I often find small pieces of Unakite in some gravel parking lots in northeast Metro Atlanta.  

So if you see me apparently mesmerized, looking down at a local gravel parking lot, that is what I am looking for.  (I am so easily entertained.)  Virginia and New Jersey are also producers of Unakite.

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Friday, December 11, 2020

Kingman Turquoise Mine promo video


While traveling back from Phoenix in 2016 (by the "scenic route") I stopped at the Kingman Turquoise/Colbaugh Processing shop (north of Kingman, AZ) and made a few purchases (Figure 1).

Figure 1.

I was on my way from Phoenix to St. George, Utah to visit Zion National Park the following day.  I did stop along U.S. Hwy 93 a few miles north of the shop to get some distance shots of the source mine.  Though I have forgotten the mine's proper name, it is in the Cerbat Mountains (Figure 2).

Figure 2.

My visit to Kingman Turquoise was about 4 months before I met my second wife​.  In 2018 after we were married, she and her sister stopped at Kingman Turquoise (on my recommendation) as she was helping her sister move back to Georgia from the Seattle area (due to her sister's job uncertainties).  Though my wife and I haven't been able to make any western trips yet, I thought it was cool that she got to visit one of the places where I stopped in 2016.  (She picked up a few things there, too.)

A Conversation About Turquoise with Gene Waddell


In the midst of the resurgent pandemic, Turquoise and the necklace supplies I have to work with, are on my mind.  (I make necklaces for a hobby, usually for gifts to my wife, platonic lady friends, and relatives.)

We Found The Contact Zone, The Edge Of The Volcanic Intrusion That Lays ...