biotite by-nc-sa: lore. this shows the three planes of biotite; notice the thin sheets. bryce canyon...
TRANSCRIPT
Biotite
by-nc-sa: lore
This shows the three planes of biotite;
notice the thin sheets.
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Human hand cut from biotite,
Hopewell Mound Group, Ohio, USA.
The Hopewell culture lived 200 BCE to 500 CE.
Biotite is found in igneous and metamorphic rocks.
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If heated, vermiculite expands to many times its initial volume.
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Vermiculite is found in igneous rock in which groundwater altered the
biotite to vermiculite.
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Vermiculite is used in lightweight concrete, fireproofing, and other
industrial applications.
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Vermiculite is used in potting soil and for
seedlings.
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Expanded vermiculite insulation is pebble-like, and light gold to brown colored. Dusty!
It is a pour-in product. If you walked into the attic in this picture, and stepped between the boards, your foot would sink in and lots of dust would be in the air.
Expanded vermiculite attic insulation was mined and manufactured in Libby, Montana until 1990. The vermiculite vein also contained asbestos, which resulted in contaminated product.
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Vermiculite from other mines is safe.
Vermiculite is extremely useful in
construction.
Ground gypsum and vermiculite (biotite) are pressed into inch-think sheets of fire-resistant wallboard,also known as sheetrock or drywall.
US
GS
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Vermiculite is used in fire-resistant wallboard.
US
GS
Hammered copper lamp with mica shade, c. 1915.
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Mica light fixture in modern bathroom.
Mica is a filler for paint and wallpaper.
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Mica is used as a paint extender, and to improve the texture of the paint.
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Mica-based lubricant is good
for ballistic products and
bicycle chains.
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Mica powder keeps rubber and asphalt goods from sticking to one another.
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Micas provide the sparkle in toothpaste.
US
GS
by:
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Biotite
by-nc-sa: lore
media rights
Many of the photos in this presentation were obtained through Flickr and Wikipedia.
Funded by FIPSE and by the University of Minnesota. Compiled for Dr. Kent Kirkby, Department of Geology and Geophysics, by Kate Rosok, 2007. Each displayed image
retains its original media rights. For educational purposes only; not to be used commercially.
public domain (none)
© Copyright. All rights reserved
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by
by-nd
by-sa
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