Thread: Occlusions vs. Inclusions/Naturals/Synthetics

Originally Posted by Neil Miller

To be serious for a moment (and placate the Great & Wise Oz) this does have a small bearing on razors.

"Pay no attention to that man behind the curtain."

Thunder & lightining abates & link follows to a similar thread.
http://straightrazorpalace.com/hones...ml#post1003513

Yep. Was there in the Way Back machine before posting. The Grate-poweredful Oz has spoken!

OK Oz, I have enough trouble with one window opened to searching SRP, you leading me to two....
Is this like a drug where you build a tolerance and need more to get the same out of it.....

Dang SRP Pushers your behind all the AD disorders aren't you

Originally Posted by pfries

Dang SRP Pushers your behind all the AD disorders aren't you

Just information.

Originally Posted by OCDshaver

Obviously the patterns, spots, veins are some form of variation in the make up of the stone but does that necessarily mean that its due to inclusions? Or maybe my understanding of inclusions is incorrect? Or is the crystal/harder material the definition of toxic (another term I'm not 100% sure about)?

The color is simply a reflection of chemical bonding of certain strength (more precisely differences in bonding, so when the electrons get bumped into higher energy state and then fall back to the lower state the energy difference is emitted as light of particular energy/frequency/wavelength/color).
The visible spectrum is only between roughly 800nm and 400nm, so any other wavelength is invisible.

Now, what can be the reason for particular difference in chemical bonding can vary immensely. Could be impurities of different materials, or defects in the crystalline structure, boundaries from poly-crystals, etc.
However, at the end of the day both the mechanical and the optical properties are the result of the same thing - how the electrons glue the nuclei.
It is extremely complicated problem and no umbrella statement is true.

You can have visually different colored areas on the hone surface have the exact same mechanical (abrasive) properties (to the precision we are concerned), and you can have visually uniformly colored surface have areas with different abrasive properties. For example the diamond particles on your hone could be white, or yellow, or brown - they would cut exactly the same way provided they are the same size. Or corundum, ruby, and sapphire look vastly different yet, if you'd use them for honing they'll perform the same (again given the particle sizes are the same)

Still in many cases when you see variations of color there could be differences in the abrasiveness, like the examples Neil gave. You just have to go on a case by case basis.

Another reason for changes in colour when the matrix contents are basically the same is the chatoyance effect,

This is mostly seen in gemstones, in fact the term means to shine like a cats eye and it is seen in that gemstone as well as tigers eye stones. The effect is best seen in gemstones with a curved or cabochon cut and in quartz with fibrous inclusions.

The effect can be seen in some glasses and a number of polished timbers. People describe it has having a 3D effect, as 'popping the grain' etc.

The hone stone that I have seen it displayed most often on is the Charnley Forest. When lapped to a fine degree you sometimes get the effect of being able to see below the surface of the stone, as well as shifting light and dark grain effects and variegated colours.

Regards,
Neil

Originally Posted by Jimbo

I dunno Neil, that link is tenuous at best. Not sure you're gonna fool Oz with that, he's quite sharp.

Yes, I agree Jimbo, just like a toxic inclusion...

...only joking Oz, old mate, dear pal, best buddy..)

Sincerely,
Neil

Also, some minerals are naturally dichroic and pleochroic so they can exhibit a variety of colors and the colors can be dramatically different. A good example is Tanzanite. The good original stuff was deep blue but it has flashes of green and red in it.

Then there is also a different case like Opal for instance. Common Opal is just a grayish-white mass of quartz but gem Opal has minute cracks filled with water which refracts the light causing the color.

Then there's fluorescent minerals too. It gets complicated this color thing.

Originally Posted by Neil Miller

The thing is, my dear Hirlau, that fossilised poo, aka coprolites, does not smell!

Kinda like where this ends up ........

KING CLAUDIUS Now, Hamlet, where's Polonius?
HAMLET At supper.
KING CLAUDIUS At supper! where? 19
HAMLET Not where he eats, but where he is eaten: a certain
convocation of politic worms are e'en at him. Your
worm is your only emperor for diet: we fat all
creatures else to fat us, and we fat ourselves for
maggots: your fat king and your lean beggar is but
variable service, two dishes, but to one table:
that's the end.
KING CLAUDIUS Alas, alas!
HAMLET A man may fish with the worm that hath eat of a
king, and cat of the fish that hath fed of that worm.
KING CLAUDIUS What dost you mean by this?
HAMLET Nothing but to show you how a king may go a
progress through the guts of a beggar. 31
KING CLAUDIUS Where is Polonius?
HAMLET In heaven; send hither to see: if your messenger
find him not there, seek him i' the other place