Deltoidal Icositetrahedron - Occurrences in Nature and Culture

Occurrences in Nature and Culture

The deltoidal icositetrahedron is a crystal habit often formed by the mineral analcime and occasionally garnet. The shape is often called a trapezohedron in mineral contexts, although in solid geometry that name has another meaning.

Read more about this topic:  Deltoidal Icositetrahedron

Famous quotes containing the words occurrences, nature and/or culture:

    If to be venerated for benevolence, if to be admired for talents, if to be esteemed for patriotism, if to be beloved for philanthropy, can gratify the human mind, you must have the pleasing consolation to know that you have not lived in vain. And I flatter myself that it will not be ranked among the least grateful occurrences of your life to be assured that, so long as I retain my memory, you will be thought on with respect, veneration, and affection by your sincere friend.
    George Washington (1732–1799)

    I noticed, as I had done before, that there was a lull among the mosquitoes about midnight, and that they began again in the morning. Nature is thus merciful. But apparently they need rest as well as we.
    Henry David Thoreau (1817–1862)

    Why is it so difficult to see the lesbian—even when she is there, quite plainly, in front of us? In part because she has been “ghosted”Mor made to seem invisible—by culture itself.... Once the lesbian has been defined as ghostly—the better to drain her of any sensual or moral authority—she can then be exorcised.
    Terry Castle, U.S. lesbian author. The Apparitional Lesbian, ch. 1 (1993)