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Identity HelpIndustrial or basaltic ?
8th May 2012 21:46 UTCAnonymous User
The piece under a microscope shows crystals on the concretions including what looks like hematite, and there are hair like white formations in some of the darker stuff.
8th May 2012 22:05 UTCRock Currier Expert
8th May 2012 22:40 UTCAnonymous User
8th May 2012 22:49 UTCAnonymous User
8th May 2012 23:19 UTCAnonymous User
8th May 2012 23:25 UTCAnonymous User
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> Unless there are very recent basaltic flows in
> that part of England it look like you may have
> found a piece of industrial slag. Could it be possible that becouse the dyke never reached the surface 57 mya the stuff it came into contact with was preserved to look recent ?
9th May 2012 00:18 UTCD Mike Reinke
9th May 2012 01:09 UTCPaul Brandes 🌟 Manager
9th May 2012 02:41 UTCRock Currier Expert
9th May 2012 06:45 UTCBecky Coulson 🌟 Expert
Welcome to Mindat. This is slag - both coal and ironstone furnaces produce slag like this, and ironstone was mined all around that area of Yorkshire. Yes, hairs that look like Pele's hair are found in slag. In fact, modern mineral wool is produced using slag by mimicking the formation of Pele's hair: air is blown over molten slag, in the same manner that winds blow over molten basalt in Hawaii. The Cleveland dyke shows microscopic amounts of glass in the groundmass, but nothing tachylitic (glassy like obsidian) has been found, as far as I know. Becky
9th May 2012 21:24 UTCAnonymous User
9th May 2012 21:31 UTCAnonymous User
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> Hello Heath,
> Welcome to Mindat. This is slag - both coal and
> ironstone furnaces produce slag like this, and
> ironstone was mined all around that area of
> Yorkshire. Yes, hairs that look like Pele's hair
> are found in slag. In fact, modern mineral wool
> is produced using slag by mimicking the formation
> of Pele's hair: air is blown over molten slag, in
> the same manner that winds blow over molten basalt
> in Hawaii. The Cleveland dyke shows microscopic
> amounts of glass in the groundmass, but nothing
> tachylitic (glassy like obsidian) has been found,
> as far as I know. Becky Thanks for that becky ps its Cleveland not Yorkshire ;-) We are proud of our older place name here.
9th May 2012 21:39 UTCAnonymous User
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> It looks slaggy to me Heath, and slag is very
> common and light weight,so it sits on top. Notice
> all the air bubbles. Only pumice has air bubbles,
> if stuff really is 500myo, geologic forces tend
> to do away w/ air bubbles. plus, if it were
> weathered any number of years, the miosture at
> earths' surface would leach out some iron, and
> make the rock look brown. The ropy-ness ( a
> word?) would seem to me to be the molten glass in
> the slag, not exactly pahoe pahoe lava like in
> Hawaii. Around here, slag is used as ballast in
> the railroad bed, especially under the
> not-so-heavy commuter train tracks. Just my guess Thanks Mike yes we used it round here to reclaim land for the docks. and it covers lots of the tracks around here. But it don't look like this stuff or weigh nearly as much maybee its some kind of slag ive never walked on before ?
> for you.
10th May 2012 19:17 UTCUwe Kolitsch Manager
10th May 2012 21:09 UTCAnonymous User
11th May 2012 04:39 UTCD Mike Reinke
It is probably heavy because of the iron, SG of over 7. Anything dark, esp. as dark as that piece, i chalk up to iron. Does this sound plausible?
11th May 2012 21:18 UTCAnonymous User
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