so, trying this to see if it'll help me not get sleepy during the day.......anyone know much about it?
ASD: you're too kind.
*strokes TV, heads for IBBOD*
ygmir wrote:yeah Dougly, we have chert and flint up here as boulders and rocks in the rivers. I know of lots of chert in Nevada........but as mentioned, obsidian is maybe the best! As it so happens, I have several hundred pounds here, if you want some. Happy to share.
I've had difficulty, telling chert from flint.........
^Rhino: are you sure about the labradorite in Academy black and India black? I know,for carving the "absolute black" is about the hardest and abrasive resistant.......the red cuts by chisel or sandblast pretty fast, similar to Sierry White and some of the lighter stones.
do you have a website for composition and properties? I'd love to look some stuff up.
All my info, is merely "hands on/experience" from cutting, carving, drilling, splitting and polishing, alas, no college for me.
It great, though, to have you around, for geology stuff!! I always appreciate the info, and have no issue with being told I'm wrong or mistaken..........



this is great, ^Rhino!! there is such a difference, between working it by hand your whole life, and having an education......super!^Rhino! wrote:ygmir wrote:yeah Dougly, we have chert and flint up here as boulders and rocks in the rivers. I know of lots of chert in Nevada........but as mentioned, obsidian is maybe the best! As it so happens, I have several hundred pounds here, if you want some. Happy to share.
I've had difficulty, telling chert from flint.........
^Rhino: are you sure about the labradorite in Academy black and India black? I know,for carving the "absolute black" is about the hardest and abrasive resistant.......the red cuts by chisel or sandblast pretty fast, similar to Sierry White and some of the lighter stones.
do you have a website for composition and properties? I'd love to look some stuff up.
All my info, is merely "hands on/experience" from cutting, carving, drilling, splitting and polishing, alas, no college for me.
It great, though, to have you around, for geology stuff!! I always appreciate the info, and have no issue with being told I'm wrong or mistaken..........
In the Academy Black, Yes. In the India Black, absolutely....it's also under the trade name 'Galaxy Black'. Here's the scoop on both. Both have plagioclase, which SHOULD give extra durability. It's the amount and percentages of ferromagnesian minerals which shoots the durability to hell. Here's why: Ferromags erode faster than quartz and feldspars (orthoclase and plagioclase). If it's a high perceentage of hornblende, biotite or muscovite mica, or augite in the final crystallized rock, then the rock erodes a lot faster than something like Missouri Red, which is primarily orthoclase and quartz alone, with a little bit of plagioclase. Academy black is actually a fine-grained gabbro from the Academy Pluton (Jurassic age)http://www.stoneply.com/stones/academygranite from the Sierra Nevadas, India Black appears to be a true gabbroic rock composed of labradorite, a particular chemistry of plagioclase. See the iridescent lath-shaped crystals in the stone? http://www.graniteprofessionalsnj.com/g ... ranite.jpgThat's labradorite in a polished rock.
That's the problem with 'trade names' They'll lead you down the garden path and then slam you on one side of the head and make you seem foolish. My only advantage is that I know a few of the trade names and can look up the rest with google. google the trade name and state that it's a polished stone, and you can find out the composition pretty easily. I enjoy helping quarry operators, stonecutters, carvers, and polishers with my best 'guesstimates'. We just need a more common language in referring to stone composition.
Just getting back to this now. Apologies!ygmir wrote:yeah Dougly, we have chert and flint up here as boulders and rocks in the rivers. I know of lots of chert in Nevada........but as mentioned, obsidian is maybe the best! As it so happens, I have several hundred pounds here, if you want some. Happy to share.
I've had difficulty, telling chert from flint..........
ha!! I had one once! I've seen the little electric ones like at home depot, used for making lots and lots of polished stones at once.FIGJAM wrote:I can see it now.
Ygmir finds a concrete truck and turns it into a tumbler/polisher!
Speaking of Home Depot, do you think you could make one with one of those one-man concrete mixers? I suppose you could if you had a cover. Make thousands upon thousands during the week of Burningman AT the event. Oops. Now I've said it someone will build on the idea and DO it.ygmir wrote:ha!! I had one once! I've seen the little electric ones like at home depot, used for making lots and lots of polished stones at once.FIGJAM wrote:I can see it now.
Ygmir finds a concrete truck and turns it into a tumbler/polisher!