hornblende

Common dark silicate

Hornblende is a common dark-colored mineral found in igneous and metamite rocks, belonging to the amphibole group.

It typically appears as black or greenish-black crystals with a glassy luster.

Geologists use hornblende to identify rock types and determine the conditions under which rocks formed: The granite contained visible crystals of hornblende and feldspar.

identification

black

Darkest possible hue

vitreousGlass-like in appearance
lusterSoft reflected light
opaqueImpassable to light

translucent · hardness · streak · petrographic · microscope · microprobe

crystallography

prismatic

Light-dispersing, multicolored

crystalOrdered-atom solid
cleavageTendency to split cleanly
habitSettled regular tendency

twinning · elongate · columnar · bladed · acicular · massive · granular · stubby · striated · termination

metamorphic

amphibolite

Metamorphosed mafic rock

schistPlaty-mineral metamorphic rock
gneissFoliated metamorphic rock
metamorphismHeat-pressure mineral alteration

foliation · porphyroblast · regional · contact · pressure · temperature · recrystallization · prograde · retrograde

igneous

granite

Igneous rock, quartz-rich

dioriteFeldspar-hornblende igneous rock
gabbroDark intrusive igneous rock
andesiteIntermediate volcanic rock

plutonic · intrusive · crystallization · magma · groundmass · intermediate · cooling · volcanic

composition

silicate

Oxygen-bound crystal compound

calciumElement twenty, builds bones
ironElement twenty-six
magnesiumAlkaline earth metal

aluminum · sodium · potassium · hydroxyl · oxide · ferrous · ferric · titanium · fluorine · chlorine

amphibole

calcic

Containing calcium compounds

amphiboliteMetamorphosed mafic rock

hornblende

black

prismatic

amphibolite

granite

silicate

calcic

hornblende

Opposites

Categories

Family