Slate [SPSL]

Glossary for gem taxonomy

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Details: Written by: admin; Category: terms; Published: 13 March 2023; Hits: 505

Slate is a very fine-grained metamorphic rock that easily splits into characteristic, thin slices, i.e. it is very cleavable. Slate is characteristically grey or grey-blue (but can also be black, green, purple, red, or brown). Because it is composed mainly of fine-grained mica flakes and quartz, it is intermediate in hardness, but can still be scratched by metal. It has a dull luster and strong cleavage. Its nonabsorbent properties and durability make it a popular material for roof tiles and paving slabs, and in some cases it is used for wall construction.

SPSL_Chile_Brzev_2

SPSL_Chile_BrzevS_1

Slate stone used for wall construction in coastal areas of Chile (S. Brzev)

SPSL_Pakistan_SHLodi_1

SPSL_Pakistan_SHLodi_2

Slate stone used for wall construction, Pakistan (S.H.Lodi)