- has
octahedral cleavage.
Dodecahedral cleavage occurs when
there are six
cleavage planes in a crystal.
Sphalerite has
dodecahedral cleavage.
Crystal parting...
-
rhombohedral cleavage.
Octahedral cleavage (four directions) is
present in
fluorite and diamond, and
sphalerite has six-directional
dodecahedral cleavage. Minerals...
- are
important controls.
Sphalerite possesses perfect dodecahedral cleavage,
having six
cleavage planes. In pure form, it is a semiconductor, but transitions...
- isotropic. But here again, its low
hardness (2.5–4) and
perfect dodecahedral cleavage preclude sphalerite's wide use in jewelry. Two calcium-rich members...
- digenite, and
chalcocite is common. Rare
crystals are
approximately cubic,
dodecahedral, or octahedral.
Usually m****ive.
Penetration twinning on the crystallographic...
-
Prismatic calcite Prismatic calcite Stalactitic calcite Hexagonal calcite Dodecahedral calcite Bipyramidal calcite Druse calcite Twinned calcite Globular calcite...
-
isometric system hexoctahedral class,
appearing as cubic, octahedral, or
dodecahedral forms, or in combinations.
Penetration twins frequently occur. In spite...
- may show a pale
pinkish purple hue in plane-polarized light. The lack of
cleavage,
commonly euhedral crystal morphology, and
mineral ****ociations should...
- and anions. Haüyne
crystallizes in the
isometric system forming rare
dodecahedral or pseudo-octahedral
crystals that may
reach 3 cm across; it also occurs...
- picornaviruses. The
viral particles themselves are not
enveloped and are
dodecahedral in structure. The
viral proteins are
translated as a
single long polypeptide...
