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| From our Mineral Department, Mother Nature's own contributions to the
World of Optics.
A great addition to any optics science project. For more unusual minerals,
click on "The Earth" above. .
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Iceland Spar |
Pink Variety |
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Iceland Spar
First discovered in Iceland, but since found in several other locations,
it is a clear form of calcite (a carbonate). To those who maintain
that "there are no straight lines in nature, we refer to them to
this specimen, characterized by straight lines and right angles.
But its most unique characteristic is that it transmits a double image,
demonstrating double refraction. We offer beautiful specimens, around 2 1/2" square and a half inch thick. |
Iceland Spar - Clear
No. SL275-S3. Only $12.50 |
Iceland Spar - Pink Variety.
No. SL275-P3. Only $11.50 |
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The "TV Rock"
This is Ulexite, a borate. Often called, "The Television Stone,"
it is one of nature's most unique minerals.
It's semi-transparent. Lay it on top of an image and it is naturally projected to
the top surface of the stone. Not only a unique mineral, but also great for science
projects. At present, we can only provide 3/4" - 1 1/4" specimens.
No. SL275-V3. Only $5.95 |
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