- of
fractures are
recognized in mineralogy: conchoidal, earthy, hackly,
splintery (or fibrous), and
uneven factures.
Conchoidal fracture breakage that resembles...
- perfect, two
directions in the
shape of a diamond;
fracture is uneven,
splintery. It is
often translucent to
nearly opaque.
Riebeckite was
first described...
-
habit Intergrown grainy or fine
fibrous aggregate Cleavage None
Fracture Splintery Tenacity Brittle Mohs
scale hardness 6–7
Diaphaneity Translucent, opaque...
-
tabular hexagonal prisms Cleavage No true
cleavage Fracture Conchoidal,
splintery Tenacity Brittle Mohs
scale hardness 9.0
Luster Subadamantine, vitreous...
-
amorphous quartz, of a
slightly tougher and
finer grain than jasper, and less
splintery than hornstone. It was the
Lydian stone or
touchstone of the ancients...
- 60 g/mol
Color Reddish, orange,
brownish Cleavage Absent Fracture Uneven,
splintery,
conchoidal Mohs
scale hardness 6.5–7.0
Luster Waxy to
resinous Streak...
-
prismatic cleavage and its
fracture is
uneven to
irregular (sometimes
splintery). It is
considered brittle and its
streak is white. The
refractive index...
-
Formula m**** 60 g/mol
Color Various Cleavage Absent Fracture Uneven,
splintery,
conchoidal Mohs
scale hardness 6–7
Luster Waxy, vitreous, dull, greasy...
-
twinning on the
rhombohedron [1011
Cleavage Poor
Fracture Conchoidal,
splintery Mohs
scale hardness 9.0
Luster Vitreous Streak Colorless Diaphaneity Transparent...
-
Cleavage Perfect on {010},
distinct on {100}
Fracture Conchoidal on {100},
splintery parallel to [001]
Tenacity Flexible,
inelastic Mohs
scale hardness 1.5–2...
