jamesp
Cave Dweller 
Member since October 2012
Posts: 36,612
|
Post by jamesp on Feb 5, 2015 4:34:15 GMT -5
jamesp-
Um, I have him mildly sedated... JUST KIDDING!! Two days of wielding that wet/grinder on rocks whooped his @ss, I'm afraid. And the job was finished off at PT this morning, the therapist really gave him a work out.
He is resting comfortably (he's taking a nap). Don't think he'll be playing with rocks today, lol!
It is a sunny 74 degrees right now (seems hotter than that), and I just got back from walking. Got sweat dripping from me. Now I understand being simultaneously rare and well done at the same time... (Redundant, too!) Describes me right now - ha. Stick a fork in me, I'm done! The things we do for our woman. You guys have us over a barrel. What's next on Bob's honey do ? |
|
Deleted
Deleted Member
Member since January 1970
Posts: 0
|
Post by Deleted on Feb 5, 2015 10:25:05 GMT -5
Magnetic ehhhj....
Have you scratch tested? Do you have a sapphire you can scratch?
Ferrosilicon?
Need to do specific gravity.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,612
|
Post by jamesp on Feb 5, 2015 10:47:28 GMT -5
Magnetic ehhhj.... Have you scratch tested? Do you have a sapphire you can scratch? Ferrosilicon? Need to do specific gravity. Maybe some of Bob's tungsten carbide tool bits would tell. Guessing the SiC would fracture before it scratched it though. "Tungsten carbide measures a nine on Moh's hardness scale, meaning it is about as hard as corundum, but not as hard as diamond." |
|
Deleted
Deleted Member
Member since January 1970
Posts: 0
|
Post by Deleted on Feb 5, 2015 10:55:29 GMT -5
Magnetic ehhhj.... Have you scratch tested? Do you have a sapphire you can scratch? Ferrosilicon? Need to do specific gravity. Maybe some of Bob's tungsten carbide tool bits would tell. Guessing the SiC would fracture before it scratched it though. "Tungsten carbide measures a nine on Moh's hardness scale, meaning it is about as hard as corundum, but not as hard as diamond." Good call. mrrockpickerforever please read above. |
|
|
|
Post by rockpickerforever on Feb 5, 2015 11:10:18 GMT -5
@shotgunner, I wondered how long before you requested tests. Will have Bob try a scratch test, and see what I can do for the SG.
|
|
|
|
Post by rockpickerforever on Feb 5, 2015 11:15:41 GMT -5
jamesp-
Um, I have him mildly sedated... JUST KIDDING!! Two days of wielding that wet/grinder on rocks whooped his @ss, I'm afraid. And the job was finished off at PT this morning, the therapist really gave him a work out.
He is resting comfortably (he's taking a nap). Don't think he'll be playing with rocks today, lol!
It is a sunny 74 degrees right now (seems hotter than that), and I just got back from walking. Got sweat dripping from me. Now I understand being simultaneously rare and well done at the same time... (Redundant, too!) Describes me right now - ha. Stick a fork in me, I'm done! The things we do for our woman. You guys have us over a barrel. What's next on Bob's honey do ? To set the record straight, that was not on any honey-do list. It was something he decided to do all on his own, lol. The purple people eater was all polished when I got home from Dad's on Monday. So there!
Don't know what his plans are for today, but I suspect he is still feeling a little whooped. He may finish up polishing the large rock with blue streaks throughout it that we got at the Planet Mine last year.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,612
|
Post by jamesp on Feb 5, 2015 11:34:09 GMT -5
The things we do for our woman. You guys have us over a barrel. What's next on Bob's honey do ? To set the record straight, that was not on any honey-do list. It was something he decided to do all on his own, lol. The purple people eater was all polished when I got home from Dad's on Monday. So there!
Don't know what his plans are for today, but I suspect he is still feeling a little whooped. He may finish up polishing the large rock with blue streaks throughout it that we got at the Planet Mine last year.
Of course. We know the honey do list before written. And the things we do out of kindness, which out numbers the honey do list. A kindness list and a honey do list, not to mention the maintenance list, need to do list, bad time of the month list, irritable mood list, pay back list, impulse list, etc etc I find it better to get a written list, often things are forgotten. And it can be conveniently lost. |
|
Deleted
Deleted Member
Member since January 1970
Posts: 0
|
Post by Deleted on Feb 5, 2015 11:34:57 GMT -5
@shotgunner, I wondered how long before you requested tests. Will have Bob try a scratch test, and see what I can do for the SG. Looked like carborundum to me. But then the tidbit of magnetics ruined it.. Now we need data... |
|
|
|
Post by rockpickerforever on Feb 5, 2015 13:14:10 GMT -5
Data coming right up. Did some different tests on the samples in question. Scott, it being magnetic threw me for a loop as well. Tried picking it up with a stronger magnet this morning, you'd think it would glom right onto the to flat surface. No. It still tips the piece to grab it by the edge.
First the simple ones 1. Streak test - Leaves a reddish brown, almost coppery looking streak on streak plate 2. Scratch test - A carbide scribe, specifically made for scratching metal, will scratch it. A 3/4" micrograin carbide endmill, will also scratch it. A corundum stick used for dressing grinding wheels will barely touch it. A 100% pure (green is color code) welding tungsten will not scratch it.
3. SG - First I weighed a couple pieces by themselves. Sample 1 
Dry weight - .4 gms Weight in water - .4 gms SAME!
Sample 2 (larger one in upper left) 
Dry weight - 2.6 gms
Weight in water - 2.6 gms SAME!
Shouldn't you get a different weight?? Okay, now I'm confused.
So I tried something else. I have a graduated cylinder with a small diameter. I have in the past figured SG using that to get volume.
For this test, I used a handful of the pure (no attached quartz) rock. Dry weight was 9.6 gms Volume was 2ml3. Formulas I found online show this to be a density of 22.5 (Mass divided by volume:: 45g / 22ml3) Also using an online converter, this equals an SG of 22.5. Could this possibly be right?
I took chemistry, but dropped it when I saw where this little adventure was heading (read, before I got a failing grade, lol).
@shotgunner, anyone, please help! I welcome your input.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,612
|
Post by jamesp on Feb 5, 2015 14:50:48 GMT -5
The only way I would trust a scratch test on T carbide is if the SiC scratched the T carbide. T. carbide is tough and may fracture a scratch thru the SiC.
Same old problem in a lot of cases with Mohs test, tough materials can scratch brittle materials. Not much of anything tougher than T carbide. and SiC is super brittle.
If those crystals scratch T carbide they are certainly alien. But worth a try. Was worried about the beautiful sapphire ring stone being used.
I have gotten moisture in SiC. It rusts/oxidizes slightly. Enough to stick to my wife's polyethylene measuring cup and get me busted. I could not scrub it off. busto !!
What about those honey do and other lists ? I forgot about the most difficult list. It is a new list that started about 5 years ago.
It is the worst list of all. No matter how hard I try to do the things on that list she is never satisfied. Either I did it wrong or not complete or some complaint.
Don't you want to know the name of that list ??
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,612
|
Post by jamesp on Feb 5, 2015 14:58:08 GMT -5
Told ya you guys have aliens:
Naturally occurring moissanite is found in only minute quantities in certain types of meteorite and in corundum deposits and kimberlite. Virtually all the silicon carbide sold in the world, including moissanite jewels, is synthetic. Natural moissanite was first found in 1893 as a small component of the Canyon Diablo meteorite in Arizona by Dr. Ferdinand Henri Moissan, after whom the material was named in 1905.[11] Moissan's discovery of naturally occurring SiC was initially disputed because his sample may have been contaminated by silicon carbide saw blades that were already on the market at that time.[12]
While rare on Earth, silicon carbide is remarkably common in space. It is a common form of stardust found around carbon-rich stars, and examples of this stardust have been found in pristine condition in primitive (unaltered) meteorites. The silicon carbide found in space and in meteorites is almost exclusively the beta-polymorph. Analysis of SiC grains found in the Murchison meteorite, a carbonaceous chondrite meteorite, has revealed anomalous isotopic ratios of carbon and silicon, indicating an origin from outside the solar system; 99% of these SiC grains originate around carbon-rich asymptotic giant branch stars.[13] SiC is commonly found around these stars as deduced from their infrared spectra.[14]
|
|
|
|
Post by rockpickerforever on Feb 5, 2015 16:19:30 GMT -5
The only way I would trust a scratch test on T carbide is if the SiC scratched the T carbide. T. carbide is tough and may fracture a scratch thru the SiC. Same old problem in a lot of cases with Mohs test, tough materials can scratch brittle materials. Not much of anything tougher than T carbide. and SiC is super brittle. If those crystals scratch T carbide they are certainly alien. But worth a try. Was worried about the beautiful sapphire ring stone being used. I have gotten moisture in SiC. It rusts/oxidizes slightly. Enough to stick to my wife's polyethylene measuring cup and get me busted. I could not scrub it off. busto !! So, we'll have to do more scratch tests, I guess. Scratchee vs. scratcher? Suppose I can soak a piece in water and see if it rusts, too. What about those honey do and other lists ? I forgot about the most difficult list. It is a new list that started about 5 years ago. It is the worst list of all. No matter how hard I try to do the things on that list she is never satisfied. Either I did it wrong or not complete or some complaint. Don't you want to know the name of that list ?? The "honey-don't do it very well" list?
EDIT - Forgot to mention, Bob is out grinding rock with the wet grinder again. (rolls eyes) Nice day out, I think he is just enjoying being wet in the 77 degree weather, lol.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,612
|
Post by jamesp on Feb 5, 2015 19:17:36 GMT -5
A new sector of the relationship-metaphase-wow, talk about unpredictable hostility out of no wheres.
Pay back is hell. I have moved the heater under my desk. it's wonderful.(she is always hot)
A bit tricky to find stuff to scratch at that level of hardness. Wouldn't the crystal structure nail an ID ?
|
|
Deleted
Deleted Member
Member since January 1970
Posts: 0
|
Post by Deleted on Feb 5, 2015 20:08:35 GMT -5
rockpickerforeverYou specific gravity didn't work because your (a) your samples are tiny and (B) your scale cannot see small enough to measure the changes. Also; specific gravity is dry weight divided by the increase in water weight when submerged. You are not measuring volume. IE, if your water weighs 100 grams and then you chunky dunk your sample in the water without letting it touch bottom or sides and the water weighs 105.2 the increase is 5.2. If dry weight was 12.3 and the increase was 5.2 12.3g / 5.2g = SG 2.36 Notice grams divided by grams leaves no units? Specific gravity is a "no units" measurement.
|
|
|
|
Post by rockpickerforever on Feb 6, 2015 9:41:27 GMT -5
You are right on both counts. But I was sure you could get the SG if you knew the volume and weight to get the density, and then compared that to an equal volume of water? Oh well, I tried.
For now, it will go unidentified on the shelf to start collecting dust. I'll try to remember to take it to a show where they do IDs.
Thanks for your help.
|
|
Deleted
Deleted Member
Member since January 1970
Posts: 0
|
Post by Deleted on Feb 6, 2015 10:56:26 GMT -5
yeah, that dude goes to the vista show with his mini XRF machine, that will nail it.
|
|
