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  2. Granite - Wikipedia

    en.wikipedia.org/wiki/Granite

    Granite is a hard stone and requires skill to carve by hand. Until the early 18th century, in the Western world, granite could be carved only by hand tools with generally poor results. A key breakthrough was the invention of steam-powered cutting and dressing tools by Alexander MacDonald of Aberdeen , inspired by seeing ancient Egyptian granite ...

  3. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Blue Granite – Variety of monzonite, an igneous rock; Epidosite – Hydrothermally altered epidote- and quartz-bearing rock; Felsite – Very fine-grained volcanic rock that sometimes contains larger crystals; Flint – Cryptocrystalline form of the mineral quartz; Ganister – Hard, fine-grained quartzose sandstone, or orthoquartzite

  4. I-type granite - Wikipedia

    en.wikipedia.org/wiki/I-type_Granite

    I-type granites, like other granite types, can vary in crystal size from aphanitic to phaneritic; crystal size distributions include porphyritic, seriate, and rarely equigranular textures. Like other granites, phenocrysts in I-type granites are commonly feldspars, but can also be hornblende .

  5. Granite dome - Wikipedia

    en.wikipedia.org/wiki/Granite_dome

    Granite forms deep in the Earth's crust under conditions of high ambient or lithostatic pressure. In order for the granite to be exposed at the Earth's surface a considerable thickness of rock must be eroded. This unloading allows the granite to expand radially and sheet fractures form tangentially to the radial stress. This indicates that the ...

  6. Decomposed granite - Wikipedia

    en.wikipedia.org/wiki/Decomposed_granite

    Decomposed granite is a kind of granite rock that is weathered to the point that the parent material readily fractures into smaller pieces of weaker rock. Further weathering yields material that easily crumbles into mixtures of gravel -sized particles known as grus that further may break down to produce a mixture of clay and silica sand or silt ...

  7. A-type granite - Wikipedia

    en.wikipedia.org/wiki/A-type_granite

    A-type granite is a particular category of the S-I-A-M or 'alphabet' system which classifies granitoids and granitic rock by their photoliths or source. [1] [2] The 'A' stands for Anorogenic or Anhydrous, as these granites are characterized by low water content and a lack of orogenic or transitional tectonic fabric. [3]

  8. Stone sculpture - Wikipedia

    en.wikipedia.org/wiki/Stone_sculpture

    The hardest stone frequently carved is granite, at about 8 on the Mohs scale. It is the most durable of sculptural stones and, correspondingly, an extremely difficult stone to work. [2] Basalt columns, being even harder than the granite, are less frequently carved. This stone takes on a beautiful black appearance when polished.

  9. Joint (geology) - Wikipedia

    en.wikipedia.org/wiki/Joint_(geology)

    The vertical, gravitational load of the mass of a mountain-size bedrock mass drives longitudinal splitting and causes outward buckling toward the free air. In addition, paleostress sealed in the granite before the granite was exhumed by erosion and released by exhumation and canyon cutting is also a driving force for the actual spalling.

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