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Fritz
Trad climber
Choss Creek, ID
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Topic Author's Reply - Mar 10, 2015 - 05:46pm PT
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Great rocks all. I like those stacked "temporal sculptures" & I'm jealous of the other rocks being posted.
Gneiss Work!
Caymanite! I hiked around under those cliffs on a long-ago, fish/snorkel/eat/drink/swim, Cayman Brac adventure, but never noticed anything that showy. Guess I need to go back.
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Chiloe
Trad climber
Lee, NH
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Mar 11, 2015 - 09:28am PT
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By popular request, some more Caymanite:
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rmuir
Social climber
From the Time Before the Rocks Cooled.
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Mar 11, 2015 - 05:08pm PT
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Stone, rock… What's the difference?
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StahlBro
Trad climber
San Diego, CA
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Mar 12, 2015 - 07:27am PT
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Dingus,
I seem to remember 8K. I thought it was the bomb, but the SO thought I was a bit looney.
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Fritz
Trad climber
Choss Creek, ID
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Topic Author's Reply - Mar 17, 2015 - 10:00am PT
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There are some nice rocks in Idaho's Sawtooth Mountains.
Some are smaller & shiny like this smoky quartz I found while climbing there in the 1970's.
Mineral collecting in the Sawtooths has been illegal since 1991.
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WyoRockMan
climber
Flank of the Big Horns
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Mar 17, 2015 - 02:26pm PT
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Leopard Rock (actually a porphyritic gabbro) from the Bighorn Mountains WY.
A relatively rare outcrop right in the back yard! Whoot!
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limpingcrab
Trad climber
the middle of CA
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Mar 17, 2015 - 02:58pm PT
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Is mica the stuff that flakes really thin and is a little flexible?
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Reeotch
climber
4 Corners Area
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Mar 17, 2015 - 03:04pm PT
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limpingcrab
Trad climber
the middle of CA
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Mar 17, 2015 - 03:05pm PT
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Fritz
Trad climber
Choss Creek, ID
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Topic Author's Reply - Mar 17, 2015 - 04:22pm PT
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limpingcrab: I not worth schist at IDing minerals from photos, but it doesn't look like mica, but------there's a lot of mica minerals I'm not familiar with.
Your description (Is that the stuff that flakes really thin and is a little flexible?) is correct for the most common mica minerals.
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Fritz
Trad climber
Choss Creek, ID
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Topic Author's Reply - Mar 24, 2015 - 03:40pm PT
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Dendrites are often mistaken for fossils. I found these at an old mine in the Utah desert back in the 1980's. They form when water rich in manganese flows along fractures and bedding planes between layers of rock, depositing dendritic crystals as the solution flows through. A variety of manganese oxides and hydroxides are involved.
This one may have been the piece I split off the first rock shown. The white spots on the edges mark rock-pick strikes.
This is from the same mine, but without the spectacular colors.
This is one I found in Idaho's Lemhi Range at about 10,000' & left behind. The rock is Dolomite.
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WyoRockMan
climber
Flank of the Big Horns
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Mar 31, 2015 - 08:30am PT
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Here is a rarity.
The silvery colored mineral is Braggite (Platinum-Palladium-Nickle Sulfide) surrounded by chalcopyrite in an anorthosite matrix.
From the Stillwater Complex in south central Montana.
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this just in
climber
Justin Ross from North Fork
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Mar 31, 2015 - 08:52am PT
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Gnome Ofthe Diabase
climber
Out Of Bed
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Mar 31, 2015 - 10:28am PT
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THIS JUST IN wow^ ^ ^ ^ ^.
This just in too
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Fritz
Trad climber
Choss Creek, ID
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Topic Author's Reply - Mar 31, 2015 - 01:36pm PT
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Great rocks folks! Rock on & rock out!
Speaking of the Tucson Gem & Mineral Show, I found some photos of Brazilian quartz crystals posing there with Heidi & me a few years back.
The Brazilians did not like me bouldering on their crystals.
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Jones in LA
Mountain climber
Tarzana, California
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Mar 31, 2015 - 01:54pm PT
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Maybe not the purtyest rock, but it has a fascinating origin. I collected this sample from an underground coal mine on the island of Sumatra, Indonesia. The mine was originally opened by Japanese occupiers during WWII using local, forced labor. The coal here is a "Meta" Anthracite, because it was originally a sub-bituminous coal until being quickly transformed to Anthracite by nearby volcanic activity. Its thermal content went from 8,000 Btu/lb to 14,000+ Btu/lb in a geological instant. This coal is extremely hard and when you carry loose pieces in a bag they sound like obsidian shards as they clink together.
(the holes are the result of collecting samples for geotechnical testing)
Rich Jones
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the albatross
Gym climber
Flagstaff
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Mar 31, 2015 - 02:49pm PT
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Unfortunately not my crystal, allegedly it is valued at over $250,000
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