Inosilicate

An inosilicate is a silicate mineral whose silicon–oxygen tetrahedra share oxygen atoms in single or double chains. The chain structure distinguishes it from isolated, sheet, and framework silicates.

Silicon–oxygen tetrahedron: A structural unit with one silicon atom surrounded by four oxygen atoms at the corners of a tetrahedron. Inosilicate chains form when neighboring tetrahedra share oxygen atoms.
Single-chain silicate: An inosilicate structure in which each tetrahedron shares oxygen atoms with two neighboring tetrahedra in a repeating chain. This is the chain arrangement found in pyroxenes.
Basalt: A fine-grained volcanic rock composed mainly of plagioclase and pyroxene, with or without olivine. Pyroxene makes basalt a common setting for single-chain inosilicates.
Nesosilicate: A silicate mineral whose tetrahedra are isolated rather than joined to neighboring tetrahedra. Unlike inosilicates, nesosilicates do not form connected tetrahedral chains.
Silicate mineral: A mineral built from silicon–oxygen units, combined with other elements in a characteristic crystal structure. Inosilicates are one structural family within this broad mineral group.
Double-chain silicate: An inosilicate structure made of paired tetrahedral chains linked by additional shared oxygen atoms. This arrangement creates the wider chains characteristic of amphiboles.
Gabbro: A coarse-grained intrusive igneous rock composed chiefly of plagioclase and pyroxene. Its abundant pyroxene illustrates the role of inosilicates in deep-crystallized mafic rocks.
Sorosilicate: A silicate mineral built from pairs of tetrahedra sharing one oxygen atom. Its paired units are discrete rather than extended into inosilicate chains.
Silicate classification: A system for grouping silicate minerals by how their silicon–oxygen tetrahedra are connected. Chain connectivity is the defining basis for identifying inosilicates.
Pyroxene: A group of rock-forming inosilicate minerals with single chains of silicon–oxygen tetrahedra. Pyroxenes are the principal mineral group built from single chains.

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