Melanie Eubanks on sat 22 jun 96
Hello All,
I've been lurking on Clayart for a while and learning a lot of useful
things. Thanks for all of the info.
My question is this: Does anyone know of a source for red slate?
This is for use in a glaze.
TIA,
Melanie in Mississippi hoping for an eventless hurricane season
SLPBM@cc.usu.edu on mon 24 jun 96
You might want to check out the running tracks in your area. Often time
they will use pulverised slate as the track. Found some when I lived in
Amherst, MA at the Smith College track.
Needs to be pretty fine though for use in glazes. Havent tried grinding mine
yet. only used it in claybodies as a sub for red grog.
Alex Solla
Valice Raffi on tue 25 jun 96
>----------------------------Original message----------------------------
>My question is this: Does anyone know of a source for red slate?
>This is for use in a glaze.
I use red slate (& many other colors) with my work. Look in your yellow
pages under "Marble". I use slabs (not dust) so I don't know if this will
be a help to you. I believe the red slate comes from Vermont.
Good Luck,
Valice
scott lykens on mon 14 nov 05
i am hunting for a modern equivilant to red slate dust.
I have a new job with old library books.
This author was born in 1912, and this book was published in 1975.
The is no reference in the text to red slate dust in molecular eq, glossary
or general chemical make up.
Anyon eknow what i am looking at??
-Scott
>
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Fredrick Paget on mon 14 nov 05
>i am hunting for a modern equivilant to red slate dust.
>I ...........
>Anyone know what i am looking at??
>-Scott
>
> >
Red slate dust. That is somewhat like a high iron clay such as Red
Art or even the Chinese Zisha of Yixing
.
A few years ago when I was in Spain with Marcia Selsors group, we
stopped for lunch at the small town of Alcaraz, which sits on top of
a hill of red slate. I spotted a vacant area at the bottom of the
hill where the slate was exposed and was falling away to dust at the
bottom of a cut into the hill where they had leveled a parcel of land
to build a filling station. I came down the hill after we had parked
to get a sample of the dust since I had my eye out for red ochre that
is used in the Moorish lustre glaze process. It is called Almagra in
Spanish. There is calcium carbonate in the slate dust as well as clay
minerals and iron oxide. Later Manolo Sales of Madrid who was in our
group gave me 2 kilos of Almagra from a Spanish company called
Conesland. It is used as a pigment in many areas such as cement and
paints.
I have also gotten samples of a similar material from an outcropping
on the road up into Ojai, California. Another similar material is
Crocus Martis.
--
From Fred Paget,
Marin County, CA, USA
fredrick@well.com
Charter Member Potters Council
Ron Roy on mon 14 nov 05
Red Art would probably be a close approximation.
Many brick factories used (and some still do) ground up red shale to make
bricks.
Red earthenware clay that has been transformed by pressure into slate I think.
RR
>i am hunting for a modern equivilant to red slate dust.
>I have a new job with old library books.
>This author was born in 1912, and this book was published in 1975.
>The is no reference in the text to red slate dust in molecular eq, glossary
>or general chemical make up.
>Anyon eknow what i am looking at??
>-Scott
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Steve Slatin on mon 14 nov 05
Scott --
Slate is a rock, not a mineral, so its contents vary.
Typically it's mica, quartz, and hematite, with small
amounts of other materials sprinkled throughout. It
gets its splittable character from from it's
metamorphic formation and from the shale it's
typically formed from. When there's lots of chlorite
present it tends to be green or gray, when there's
iron oxide in it it's red, and sometimes it's purple
(I can't remember why).
Because it does vary, the most likely way to get a
perfect match would be to get some dust from a slate
cutter mining the same seam as your author got theirs
from. Of course it's unlikely that this will be
possible.
How much is called for in the recipe you're trying to
recreate? It's clearly cheating in mineralogical
terms, but if I weren't trying to replace too much of
a glaze recipe, I'd try at least a test with an
iron-rich red clay as a replacement. That'll give you
lots of silica, some alumina and some iron. Red
slate's probably mostly silica with some alumina and
some iron. As subs go, you could do worse.
I put a slate floor in a kitchen once -- looked great,
but anything that got dropped broke into a million
incredibly sharp shards ... not one of my better
ideas.
Best wishes -- Steve S.
--- scott lykens wrote:
> i am hunting for a modern equivilant to red slate
> dust.
> I have a new job with old library books.
Steve Slatin --
And I've seen it all, I've seen it all
Through the yellow windows of the evening train...
__________________________________
Yahoo! Mail - PC Magazine Editors' Choice 2005
http://mail.yahoo.com
Paul Herman on mon 14 nov 05
Hello Scott,
Slate can be as varied as "clay", so who knows what the molecular
equivalent is?
Maybe try using Redart clay, which is a milled clay/shale mineral.
What are you trying to do, anyway?
Best,
Paul Herman
Great Basin Pottery
Doyle, California US
http://greatbasinpottery.com
On Nov 14, 2005, at 12:59 PM, scott lykens wrote:
> i am hunting for a modern equivilant to red slate dust.
> I have a new job with old library books.
> This author was born in 1912, and this book was published in 1975.
> The is no reference in the text to red slate dust in molecular eq,
> glossary
> or general chemical make up.
> Anyon eknow what i am looking at??
> -Scott
>
Hank Murrow on mon 14 nov 05
On Nov 14, 2005, at 12:59 PM, scott lykens wrote:
> i am hunting for a modern equivilant to red slate dust.
> I have a new job with old library books.
> This author was born in 1912, and this book was published in 1975.
> The is no reference in the text to red slate dust in molecular eq,
> glossary
> or general chemical make up.
> Anyon eknow what i am looking at??
Dear Scott;
Well, I am just thinking about what slate really is, and since it is
clay that has undergone enough pressure and heat to metamorphose into
rock(sort of), I imagine that if you calcine some red clay(to eliminate
the plasticity), you would have something approximating red slate dust.
Hope this tip is worth more than 2 cents!
Cheers, Hank
www.murrow.biz/hank
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