Re: KRS - artificial weathering

From: zolota (zolota3_at_REMOVEshaw.ca)
Date: 09/20/04 

Date: Mon, 20 Sep 2004 06:45:44 GMT

"Daryl Krupa" <icycalmca@yahoo.com> wrote in message
news:c70365ef.0409191839.57b928de@posting.google.com...
> "zolota" <zolota3@REMOVEshaw.ca> wrote in message
> news:<YX92d.441656$gE.137762@pd7tw3no>...
>
> <snip>
>
>> As I said before, sulphuric acid cannot eat a calcite crystal.
>> I also assume that you know that.
> <snip>
>
> Yes; I was thinking about protecting the calcite from the
> effects of the sulfuric acid sufficiently to avoid
> the possibility of forming a gypsum layer,
> and so avoid detection of application
> of the sulfuric acid.

True, but agogle on minnesota, groundwater, so4 gives over 2,300 hits and i
quote one:
Sulfate (SO4) occurs naturally in most of Minnesota's goundwater, with
higher levels common in the western part of the state. At high levels,
sulfate can give water a bitter or astringent taste and can have laxative
effects. This brochure provides a basic discussion of sulfate in well water
and discusses action you can take to minimize it effects.

http://www.health.state.mn.us/divs/eh/wells/sulfate.html

In other words, finding a calcite crystal with a gypsum surface is entirely
logical in Kensington so could anyone say that it's presence is
questionable? They could say that only if they have tested other local rocks
that contain calcite and found gypsum to be absent. By the same reasoning i
would expect the same depth or nature of sulphate in calcite on both the
ancient back of the KRS and the inside of the letters.

>
>> A good page that covers several of the topics is available.
>> Note the coment about oxidation of biotite mica.
>>
>> http://gpc.edu/~pgore/geology/geo101/weather.htm
>
> Yes, I agree, good background, and I've noted that page already.
> There is also this one, which Hmmm, I wonder, might have
> inspired Wolter to test slate tombstones instead of marble ones
> (marble, at least, is similar in composition to the calcite
> on / in the KRS):
>
> http://www.uwgb.edu/dutchs/EarthSC202Slides/soilslid.htm
>
>> Than you, thank you very much.
>
> http://homepages.compuserve.de/thkoern/elvis.gif
>
> Roll with them Stones . . .
>
> http://www.omelete.com.br/imagens/televisao/news/simpsons/rock.jpg
>
> http://figures.nohomers.net/Customs/Custom_Bart_as_Elvis.JPG
>
> Daryl Krupa
> (still playing D.A., still on the case, awaiting deposition)

Of gypsum?

Z

Relevant Pages

  • Re: what are these rocks?
    ... between calcite or chalcedone material is the acid test. ... The mangan oxide tells a little history about ... vulcano there are remaining holes in the lava. ...
    (sci.geo.geology)
  • Re: KRS - artificial weathering
    ... >>could be used to age such a surface without damaging the calcite that is ... >>Sulphuric acid immediately creates a layer of gypsum on the surface of the ... >>sulphuric acid to break down the mica. ... >>rock, producing the pits we see on formerly smoothly polished stone. ...
    (sci.archaeology)
  • Re: KRS - artificial weathering
    ... Calcite is extremely soluble and is the mineral of ... > Sulphuric acid immediately creates a layer of gypsum on the surface of the ... If there is pyrite ... Thermal cycling would leave no chemical residue ...
    (sci.archaeology)
  • Re: KRS - artificial weathering
    ... sulphuric acid cannot eat a calcite crystal. ... The same reaction with HCl is: ... about oxidation of biotite mica. ...
    (sci.archaeology)
  • Re: Puzzle...Thermic route for ferroalloy
    ... They controlled the neutralization process to make gypsum that was perfect for manufacturing process needed to make gypsum board. ... They subsequently changed to hydrochloric acid to remove the iron. ... Sulfate is the least expensive and is used to produce pigments, ...
    (sci.materials)