diabase
Dark igneous rock
Diabase is a dark, dense igneous rock with a fine to medium grain, formed when magma cools slowly underground.
It's similar to basalt in composition but coarser in texture.
Geologists and stonemasons encounter it frequently; it's durable enough for use in road construction and as crushed stone.
In British usage, the same rock is often called dolerite.
Fine-grained volcanic stone
- gabbroDark intrusive igneous rock
- pyroxeneRock-forming silicate group
- mineralogyScience of inorganic solids
- tectonicsStudy of crustal deformation
metamorphism · stratigraphy · outcrop · geochronology · paleomagnetism · petrology · geochemistry · thin section
Window's bottom ledge
- dikeWall against flooding
- plutonSubterranean cooled magma body
- magmaMolten rock underground
- emplacementPrepared weapon position
solidification · cooling · subsurface · underground · chamber · country rock · contact · sheet
Combined sum total
- crushed stoneMechanically broken rock fragments
- pavingLaying hard ground cover
- curbingLimiting or restraining
- riprapLoose stone for stabilization
quarry · durability · roadbed · ballast · building stone · masonry · cobblestone · traprock
Rock-forming silicate group
- olivineGreen igneous rock mineral
- interlockingEngaging by overlap
- textureSurface tactile quality
- grainCereal plant's harvest unit
groundmass · microcrystalline · crystal · interstitial · mineral · euhedral
basalt
Fine-grained volcanic stone
- gabbroDark intrusive igneous rock
- pyroxeneRock-forming silicate group
- mineralogyScience of inorganic solids
tectonics · metamorphism · stratigraphy · outcrop · geochronology · paleomagnetism · petrology · geochemistry · thin section · greenstone
sill
Window's bottom ledge
emplacement · solidification · cooling · subsurface · underground · chamber · country rock · contact · sheet · injection
aggregate
Combined sum total
- crushed stoneMechanically broken rock fragments
- pavingLaying hard ground cover
- curbingLimiting or restraining
riprap · quarry · durability · roadbed · ballast · building stone · masonry · cobblestone · traprock
pyroxene
Rock-forming silicate group
- olivineGreen igneous rock mineral
- interlockingEngaging by overlap
- textureSurface tactile quality
grain · groundmass · microcrystalline · crystal · interstitial · mineral · euhedral