Table
T5. Textural terms and abbreviations used to describe sulfide
mineralization.
Styles
of mineralization:
Massive
sulfide
MS
Rocks
containing >75% sulfide minerals.
Semimassive
sulfide
SMS
Rocks
containing >25%-75% sulfide minerals, which form aggregates or
intergrowths.
Disseminated
sulfide
DS
Rocks
containing 5%-25% disseminated sulfides.
Void
fill
VF
Minerals
partially or totally filling a void (vesicle, etc.).
Vein/stringer
sulfide
VS
Rocks
containing more than 5% sulfide in veins.
General
terminology for mineral textures:
Atoll
at
Minerals
surrounded and partially replaced by another.
Banded
bnd
Precipitates
showing rhythmic compositional or textural layering.
Bladed
bld
Elongate
to tabular platy crystals.
Botryoidal
bot
Aggregate
of spherical shapes (also termed globular).
Clastic
cl
Fragmental
with or without evidence of reworking.
Chalcopyrite
disease
Fine
inclusions (emulsion) of chalcopyrite in sphalerite.
Cockade
cock
Open-space
vein filling in successive comb-like crusts.
Colloform
col
Finely
laminated texture formed by rhythmic precipitation.
Dendritic
den
Minerals
deposited in a fine branching pattern.
Disseminated
dis
Discrete
grains or aggregates of a mineral distributed throughout a rock.
Druse
dr
A
mineral surface covered with small projecting crystals.
Felted
fel
Lath-shaped
crystals interwoven in an irregular fashion.
Framboidal
frm
Spheroidal
aggregates of microscopic grains.
Granular
gran
Aggregates
of crystals with a sugary texture.
Intergrown
ig
Minerals
with shared grain boundaries and textures.
Interstitial
int
Occupying
the space between other mineral phases.
Massive
msv
Uniform,
essentially monomineralic material.
Matrix
mat
Minerals
occurring as fine material between clasts in fragmental rocks.
Nodular
nod
Discrete
subrounded aggregates, commonly colloform or radial mineral growths.
Poikilitic
poi
Mineral
grains included as fine inclusions within the crystal of another mineral.
Porous
por
Texture
with >10% open pore spaces.
Pseudomorph
pse
Replacement
of one mineral by another with retention of the original crystal form.
Radial
rad
Mineral
aggregates formed by growth radiating from a single point.
Relict
rel
Remnants
of sulfide grains that have been partially dissolved or replaced.
Skeletal
skel
Development
of the outline of a crystal without complete infill.
Sooty
soot
Extremely
fine grained mineral that is not visible optically but is sufficiently
abundant to color its matrix.
Veined
vnd
Mineral
crosscut by veins of another material.
Vermicular
vrm
Wormlike
intergrowths of one mineral with another.
Vuggy
vug
Rock
containing coarse (<2 mm) pore spaces.
Additional
textural terms applied to
veins:
Anastomosing
ana
Mutually
intersecting vein network.
Barren
bar
No
sulfide minerals in vein fill.
Branching
bra
Single
vein split into two or more veins.
Halo
hal
Alteration
extending outside the vein into wallrock (note difference with selvage).
Parallel
par
Two
or more veins with the same orientation.
Selvage
sel
Mineral
precipitation along edge of vein at contact with wallrock (note difference
with halo).