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Quarry in the mirror.

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Copyright © JH
 
 

Quarry in the mirror.

Copyright © JH  - This image is copyrighted. Unauthorized reproduction prohibited.

An old quarry,which became a famous tourist sight.
Photo Jana Hrůzková.

This Photo was Mindat.org Photo of the Day - 14th Nov 2018

This photo has been shown 504 times
Photo added:8th Nov 2018
Dimensions:2592x1944px (5.04 megapixels)
Date/Time of Photo:14th Aug 2017 16:08:12
Camera:SONY DSC-HX9V
Software:Microsoft Windows Photo Viewer 6.3.9600.17415
Exposure time:1/100s
Aperture:f/8.0
Focal Length:4mm
ISO speed:100
View Libor Hruzek's Photos

Discuss this Photo

PhotosKamenický Šenov-Panská skála, Česká Lípa, Liberec Region, Czech Republic

14th Nov 2018 02:20 GMTPaul Brandes Manager

Phenomenal photo of a beautiful place!

Interesting to think that someone would dig a quarry among columnar basalt.

14th Nov 2018 18:50 GMTEd Clopton Expert

05778250015651967939216.jpg
Beautiful photo and location! I would love to see it in person some day.


As to who would quarry columnar basalt, there's at least one other location I know of. This picture postcard can't compare aesthetically with the POD, but it shows another quarry in columnar basalt. The text printed on the back of the card states "Columns of Basalt Rock near Emigrant, Montana, are broken for bridge riprap and crushed for railroad track ballast. The Lyons Construction Co. operates the quarry for the Northern Pacific Railway Co. Bill Whithorn photo" The card is unused and carries no copyright date, but the format is probably no earlier than about 1960, and reference to the Northern Pacific Railway dates it to before the Burlington Northern merger in 1970.


14th Nov 2018 19:12 GMTDavid Von Bargen Manager

The advantage is that you probably don't need to use explosives to break up the rock and will end up with a relatively uniform size of product.

14th Nov 2018 19:14 GMTKevin Conroy Manager

I wonder if the magical lapidary world has discovered that if they fashion an end (or ends) on a column, polish all of the sides and call it abracadabraite, then they can sell it to the unwitting masses for big bucks.

14th Nov 2018 19:41 GMTDoug Schonewald

Here in Washington they mine/quarry columnar basalt extensively on private property. the columns bring a premium when purchased for use in landscaping. The shorter columns are often drilled, worked, and plumbed into landscaping fountains which cost a small fortune on the retail market. It is doubtful that is what is going on here, but in the western USA there is a high demand for intact columns and knick-knacks made from columns.

14th Nov 2018 19:48 GMTDoug Schonewald

Kevin,

Lapidarists here cut pieces of the columns into thin sections (about 1/8" as I recall) and put it on a flat lap. They use this for backing on transparent cabochons to enhance the color of the primary stone. They have a fancy name for the basalt that they use for this. I believe they call it "basenite". They also have a fancy price for this material that is currently running around $8/slab.

14th Nov 2018 21:26 GMTKeith Compton Manager

0195121001232164601.jpg
Columnar basalt is quarried at Kulnura quarry :

15th Nov 2018 21:44 GMTEd Clopton Expert

General question: How large/small does columnar jointing in igneous rock get? I have only seen it in person a time or two, and it's hard to judge scale from most of the photos. The examples I have seen seem to run in the 20-30 cm range. Do columns get significantly smaller or larger than that?

16th Nov 2018 04:58 GMTKevin Conroy Manager

Devil's Tower columns are about 6 feet, or 183 cm across.

20th Nov 2018 20:32 GMTErik Vercammen Expert

Douglas,


The name of the rock is "basanite"; it is in the Mindat glossary https://www.mindat.org/glossary.php?frm_id=glos&cform_is_valid=1&s=basanite&submit_glos=Search+Glossary

20th Nov 2018 21:02 GMTFrank K. Mazdab Manager

"basenite" (however it might be spelled) as a trade name for a dark basalt-like building stone, and basanite as the ultramafic/mafic extrusive rock with ~41 to ~49 wt% SiO2, ~3 to ~9 wt% Na2O+K2O, >10% olivine, and feldspathoid-normative, need not necessarily be the same material. Basanite the rock is actually relatively rare, so almost certainly the vast amount of material sold with that name for the building industry is just the more mundane "basalt".
 
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