amphibole
Dark rock mineral
Amphibole is a group of dark silicate minerals common in igneous and metamite rocks.
Amphiboles form elongated, prismatic crystals and include varieties like hornblende and tremolite.
They're distinguished from similar-looking pyroxenes by their crystal structure and cleavage angles.
Amphiboles are major components of many rock types and important indicators in geological analysis.
Made of threads
- carcinogenicCauses cancer
- mesotheliomaMalignancy of organ linings
- hazardousLikely to cause injury
- abatementDecrease in force
regulations · insulation · fireproof · mining · lung disease · occupational · industrial · friable
Light-dispersing, multicolored
- cleavageTendency to split cleanly
- lusterSoft reflected light
- twinningForming identical pairs
- habitSettled regular tendency
elongate · columnar · acicular · bladed · fibrous · aggregate · inclusion · vitreous
Platy-mineral metamorphic rock
Silicate mineral, greenish
- carvingShaping by cutting away
- ornamentalFor beauty, not function
- greenstoneMetamorphosed rock, often jade
- polishSmooth by rubbing
hardness · toughness · jewelry · sculpture · lapidary · cabochon · translucent · carved
Fine-grained volcanic stone
- andesiteIntermediate volcanic rock
- gabbroDark intrusive igneous rock
- dioriteFeldspar-hornblende igneous rock
- magmaMolten rock underground
plutonic · volcanic · intrusive · intermediate · crystallization · groundmass · fractionation
hornblende
Calcium-iron amphibole mineral
fibrous
Made of threads
- carcinogenicCauses cancer
- mesotheliomaMalignancy of organ linings
- hazardousLikely to cause injury
abatement · regulations · insulation · fireproof · mining · lung disease · occupational · industrial · friable · exposure
prismatic
Light-dispersing, multicolored
habit · elongate · columnar · acicular · bladed · fibrous · aggregate · inclusion · vitreous · silky
schist
Platy-mineral metamorphic rock
prograde · retrograde · pressure · temperature · recrystallization
nephrite
Silicate mineral, greenish
- carvingShaping by cutting away
- ornamentalFor beauty, not function
- greenstoneMetamorphosed rock, often jade
polish · hardness · toughness · jewelry · sculpture · lapidary · cabochon · translucent · carved · decorative
basalt
Fine-grained volcanic stone
- andesiteIntermediate volcanic rock
- gabbroDark intrusive igneous rock
- dioriteFeldspar-hornblende igneous rock
magma · plutonic · volcanic · intrusive · intermediate · crystallization · groundmass · fractionation