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Marble is a crystalline, compact variety of metamorphosed limestone, capable of taking a high polish. Commercially the term is extended to include any rock composed of calcium carbonate that takes a polish, and includes some ordinary limestones; the term is further extended in the loose designation of stones such as alabaster, and serpentine.   Info and gallery...

The term granite has been applied to almost any igneous stone of visible crystaline formation and texture that can take a polish. True granites provide many of these stones but other types of igneous rock that may fall under this classification include syenites, gabbros, dolerites and diorites. The metamorphic stones gneiss, schist and granulite are also frequently included within the classification of 'granite'.  Info and gallery

Sandstone is a durable coarse-grained type of sedimentary rock,consisting of consolidated masses of various mineral particles, mainly quartz, mica and felspar deposited by moving water or by wind, which has then been compacted over time by overlying deposits of sediments and bonded together with natural cements such as silica, calcium carbonates, iron oxides and clays.  Info and gallery

Limestone is a sedimentary rock consisting largely of calcium carbonate (CaCO),usually in the form of the mineral . It may be produced biologically,chemically, or physically. Most of the world’s ocean floors contain limestone that formed from the shells of dead marine organisms that drifted downwards through the water and settled on the sea floor. Info and gallery

Slate is a dense, fine-grained, fissile rock, formed by the metamorphism of shale or clay, or more rarely of igneous rocks. The process of metamorphism results in consolidation of the origina lrock and in formation of new cleavage planes along which slate characteristically splits into thin, broad sheets. Info and gallery

Natural Quartzite
Quartzite, not to be confused with the mineral quartz, is a hard, metamorphic rock which was originally sandstone. Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts.. Natural quartzite should not be confused with the artificial 'quartzite' tiles now produced. Info and gallery

Travertine is a sedimentary rock. It is a natural chemical precipitate of carbonate minerals; typically Aragonite, but often recrystallized to, or primarily, Calcite. Being formed very slowlt, it often incorporates dead matter such as tress debris that later rots away to leave a voided structure. Info and gallery

Serpentinite is a rock composed of one or more serpentine minerals. Minerals in this group are fromed by serpentinization, a hydration and metamorphic transformation of ultamafic rock from the Earth's mantle, usually in a submarine environment. Most green or 'verde' marbles are serpentinites and are considered separately to tru marble because its origin is often the result of the metamorphism of rocks other than limestones. Info and gallery

Tuff is a type of rock consisting of volcanic ash, ejected from vents during a volcanic eruption, that has been consolidated, cemented or otherwise hardened to form solid rock. However, the term is also used for many pyroclastic rocks that have undergone limited posteruption reworking such as folding and shearing; for example many of the green slates of the lake district in Cumberland are fine cleaved ashes. Info and gallery