Laser Tracking on the CD Scaled Views of a Compact Disc
Laser Tracking on the CD Scaled Views of a Compact Disc
Laser Tracking on the CD Scaled Views of a Compact Disc
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Both calcite samples above are about 12-15 cm in width. The right image above is from Santa<br />
Eulala, Mexico<br />
Calcite<br />
The varieties <strong>of</strong> calcite, CaCO 3 , are so numerous and so varied that an entire display case at <strong>the</strong><br />
Smiths<strong>on</strong>ian Museum <strong>of</strong> Natural History is devoted to just calcite. Calcite is <strong>the</strong> most abundant <strong>of</strong><br />
<strong>the</strong> carb<strong>on</strong>ate minerals. The sample shown above and in <strong>the</strong> closeup view below is called cobaltian<br />
calcite. The sample is about 9x12 cm. The 3.9 carat gem at right is from Spain. All <strong>the</strong>se samples<br />
are part <strong>of</strong> <strong>the</strong> gem and mineral exhibit at <strong>the</strong> Smiths<strong>on</strong>ian Museum <strong>of</strong> Natural History.
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