the tendency of a mineral to split consistently along certain planes where the atoms are weakly bonded.
– no definite planes of weakness in the bonding of the atoms so the mineral just breaks along irregular surfaces.
CONCHOIDAL fracture –
irregular breakage, surfaces are somewhat curved (like the way glass breaks)
Quartz is noted for its conchoidal fracture
fracture – breakage surfaces are jagged (such as the mineral copper)
– some minerals break apart in no distinguishable pattern.
like a natural magnet
bubbly reaction in HCl, “fizzing” (calcite)
emits an electric current when put under pressure (quartz)
doubling of images when
light passes through
mineral (calcite, fluorite) glow when subjected to ultraviolet (black) light
colorful hue seen at
certain angles while
the mineral labradorite
of very fine parallel
scratches found on
the cleavage surfaces
of some minerals
. Van der Waals
weak attraction between chains or sheets of atoms
atoms share electrons
atoms attracted by opposite charges imparted by gain or loss of electrons.