- sheets.
Prismatic cleavage occurs when
there are two
cleavage planes in a
crystal that
intersect at 90 degrees.
Spodumene exhibits prismatic cleavage. Non-Prismatic...
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often have a
thick tabular habit, but are rare. It has a perfect,
prismatic cleavage,
almost at
right angles. The
hardness is 5.5–6.5, and the specific...
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typically dull
green crystals in the
monoclinic prismatic class. It has two
distinct prismatic cleavages at 87 and 93°
typical of the
pyroxene series. It...
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xenotime may
sometimes occur.
Xenotime has two
directions of
perfect prismatic cleavage and its
fracture is
uneven to
irregular (sometimes splintery). It...
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system Triclinic Identification Color Green, blue-green
Crystal habit Prismatic Cleavage Perfect Fracture Uneven,
splintery Tenacity Brittle Mohs
scale hardness...
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weaker double refraction and
stronger pleochroism. They also have a
prismatic cleavage that is
perfect in two
directions at 90 degrees.
Enstatite is white...
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yellow or brown;
colorless in thin
section Crystal habit Pyramidic,
prismatic Cleavage {001}
perfect Fracture Subconchoidal to
rough Mohs
scale hardness...
- blue,
rarely violet;
colourless in
transmitted light Crystal habit Prismatic Cleavage None
observed Fracture Conchoidal Mohs
scale hardness 6.5 – 7.5 Luster...
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Space group P63mc
Identification Color White,
colorless Crystal habit prismatic Cleavage [1010]
Distinct Mohs
scale hardness 9
Luster Vitreous Streak White...
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rhombohedral with parallel-faced hemihedrism, and are
either lenticular or
prismatic in habit: the
lenticular habit is
determined by the
development of faces...