From:
"Bill Smith" <bsmith@xxxxxx>
Date:
Wed, 16 Feb 2000 22:50:51 -0600
Date:
Wed, 16 Feb 2000 07:58:58 -0500
Subject:
Getting Started
Regarding making talc safe for general use, e.g.. baby
powder. The primary health hazard seems to be when talc
is inhaled into the lungs over an extended period of
time. When applied externally to the body, you do not
inhale appreciable amounts of it. The powder and dust
produced when working with chisels and rifflers is very
fine and should not be inhaled.
********************************************************
This topic seems to have a general interest so I have
included for your information some definitions below:
********************************************************
Soapstone is a soft metamorphic rock composed mostly of
the mineral talc. Also called steatite. (From its smooth
soapy feel)
Talcum powder or talc is a mineral Mg3Si4O10(OH)2
consisting of a basic magnesium tetrasilicate. It is a
fine-grained white, greenish, or gray mineral, having a
soft soapy feel and used in talcum and face powder, as a
paper coating, and as a filler for paint and plastics.
Talc, soft, greasy, granular or fibrous mineral composed
of an acid metasilicate of magnesium, H2Mg3(SiO3)4. It
crystallizes in the monoclinic and orthorhombic systems.
Talc has a hardness of 1 to 1.5 and a specific gravity
of 2.7 to 2.8. It exhibits perfect basal cleavage. The
mineral ranges in color from apple-green or gray to
silver-white and shines with a pearly to greasy luster.
Talc is exceedingly common and occurs in large beds of
crystalline schists together with serpentine, dolomite,
and chlorite. The principal deposits exist in the United
States. Talc is used in soaps, lubricants, tailor's
chalk, pigments, and talcum powder.
Encarta® 98 Desk Encyclopedia © & 1996-97 Microsoft
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Excerpted from The American Heritage® Dictionary of the
English Language, Third Edition © 1996 by Houghton
Mifflin Company. Electronic version licensed from INSO
Corporation; further reproduction and distribution in
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All rights reserved.
- References
- message 00379: Getting Started - Bill Smith (15 Feb 2000)
- message 00380: Getting Started - Patrick Huss (15 Feb 2000)
- Previous by Thread: message 00392: Understanding what is soapstone - BrazilSoapstone (17 Feb 2000)
- Next by Thread: message 00389: Getting Started - Evan Hughes (17 Feb 2000)
- Previous by Date: message 00382: Getting Started - Nicoletta Pershall (17 Feb 2000)
- Next by Date: message 00396: Getting Started - Bill Smith (17 Feb 2000)
