Early technique in cutting stones

Status
Not open for further replies.
Thanks for that nice to see some (more) common sense being introduced into the conversation. Yeah, I don't know why that didn't occur to me. All you need is some reasonable outcrops of Garnet schists (for example) and bob's you're uncle, but it's the same basic principle I mentioned with the quartz. Certainly the Andes, being as tectonicly active as they are, would seem to be a reasonable place to look for such things.

but in Egypt.....
 
Silicified sandstone has a hardness of 7 (it's quartz sand embedded in a matrix of quartz). Granite has multiple minerals with hardness ranging from as low as 2, to as high as 7. The red colour of Aswan Granite comes from a high content of Orthoclase which has a hardness of 6, suggesting the granite has a hardness of between 6 and 7, so it seems reasonable to suppose that yes, silicified sandstone would be sufficiently hard to polish Aswan granite.

but could it polish diorite
 
but in Egypt.....

But in Egypt, they also had access to high grade metamorphic rocks (Gneiss) which are capable of producing gemstones such as Garnite and Saphire.

Plutonic rocks (such as granite) can produce bands of gemstones.

And, finally, there is evidence to support the hypothesis that the egyptians might have had access to Emery (i've mentioned corundum a couple of times, emery is a form of corundum, it has a hardness of 9 on Moh's scale) through trade, or through native deposits.
 
Trippy, note the wording of the paragraph and how River has misused what it says:

The following series of photographs were taken inside the Serapeum on August 27, 2001. Those taken of me inside one of these huge boxes show me inspecting the squareness between a 27 ton lid and the inside surface of the granite box on which it sits. The precision square I used was calibrated to .00005 inch (that is 5/100,000 of an inch) using a Jones & Lamson comparitor.

The SQUARE he is using has been calibrated to that level of precision.
Nothing in the article shows how close rocks are to being that square.

I wondered about that myself, but there was some mention in amongst there of the interior of the box, and I got the impression he was using to measure (among other things) the internal angles and the smoothness of the walls.
 
“ Originally Posted by river
but in Egypt.....

But in Egypt, they also had access to high grade metamorphic rocks (Gneiss) which are capable of producing gemstones such as Garnite and Saphire. Plutonic rocks (such as granite) can produce bands of gemstones

interesting



And, finally, there is evidence to support the hypothesis that the egyptians might have had access to Emery (i've mentioned corundum a couple of times, emery is a form of corundum, it has a hardness of 9 on Moh's scale) through trade, or through native deposits.

what evidence
 
I wondered about that myself, but there was some mention in amongst there of the interior of the box, and I got the impression he was using to measure (among other things) the internal angles and the smoothness of the walls.

Well it got River to claim that the rock box had that level of precision, yet the article never actually says that it does.

Indeed, the method he is shown using, just putting the square at one location for that picture, isn't clear enough for us to know how close to square the rocks are, and more importantly, how much they vary across a side.
 
what evidence
You mean aside from the fact that some Aswan sands are up to 15% emery?

It was mined on an agean island (I forget which one, might be Naxos), it is known to have been exported from there, and is known to have been imported into the region during the Third Dynasty of Ur (I seem to recall there are records of as much).

Also, Emery has a density of 3.3-3.8 as opposed to 2.59-2.63 for quartz, so if you have a sand that's rich in emery, you can increase the degree of enrichment using nothing more than water (the quartz and emery settle out at different rates, alternativly, you can use a flume with riffles in the bottom, similar to what they do for gold.
 
so this site didn't really explain , polishing did it

That's not why I posted the link.

The link demonstrates that copper tools can be used to cut diorite when used in conjunction with sand. It's the same principle as using gemstone tipped saws.

The point that you're missing, however is this:

3M_Flexible_Polishing_Papers_Detail.jpg


Anything that can be used for cutting, can also be used for polishing, it's simply a matter of how it's applied.
 
Trip

its abit of a stretch

copper and sandstone

copper is very soft for one thing

Take it up with the experimental archeologists who have been able to replicate the results.

Or do you dispute the evidence that we have?

And it was sand that was used in conjunction with the copper, not sand stone.
 
“ Originally Posted by river
Trip

its abit of a stretch

copper and sandstone

copper is very soft for one thing


Yeah, figuring it must of been aliens isn't a stretch though?

look , I know this alien perspective and truth really would produce a back lash ,

its natural

I have no problem with this

but we have to come to terms with the fact that Ancient History , B.C.E. is there

this History is not a joke , it is serious accounts , about our deeper past , there archaeology , that proves this

now we can either face this Hisotry as it is and not take it as a mythology

or explore and understand this part of our history and respect it
 
Status
Not open for further replies.
Back
Top