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Arrow_left - Rock Types
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Granite
Open-uri
A group of igneous and plutonic rocks composed primarily of feldspar and quartz. Usually contains one or more dark minerals, which may be mica, pyroxene, or amphibole.
Basalt
Open-uri
A hard rock of varied mineral content; volcanic in origin, it makes up much of the Earth's crust.
Obsidian
Stringio
a type of black glass produced by volcanos
Pumice
Open-uri
A light, porous type of pyroclastic igneous rock, formed during explosive volcanic eruptions when liquid lava is ejected into the air as a froth containing masses of gas bubbles.
Quartz
Stringio
The most abundant mineral on the earth's surface, of chemical composition silicon dioxide, SiO2. It occurs in a variety of forms, both crystalline and amorphous. Found in every environment.
Slate
Open-uri
A fine-grained homogeneous sedimentary rock composed of clay or volcanic ash which has been metamorphosed so that it cleaves easily into thin layers.
Schist
Stringio
Any crystalline rock having a foliated structure and hence admitting of ready division into slabs or slates.
Magnetite
Open-uri
A magnetic mineral, Fe3O4, one of the primary ores of iron. It has also been called lodestone.
Marble
Stringio
A rock of crystalline limestone.
Graphite
Open-uri
A gray, crystalline, allotropic form of carbon that occurs as a mineral in some rocks and can be made from coke.
Sandstone
Open-uri
A sedimentary rock produced by the consolidation and compaction of sand, cemented with clay etc.
Shale
Stringio
A fine-grained sedimentary rock of a thin, laminated, and often friable, structure.
Limestone
Open-uri
An abundant rock of marine and fresh-water sediments; primarily composed of calcite (CaCO₃); it occurs in a variety of forms, both crystalline and amorphous.