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2. Black granite - Wikipedia

   en.wikipedia.org/wiki/Black_granite

   Black granite. In the construction industry, black rocks that share the hardness and strength of granitic rocks are known as black granite. In geological terms, black granite might be gabbro, diabase, basalt, diorite, norite, or anorthosite. [1]

3. Gabbro - Wikipedia

   en.wikipedia.org/wiki/Gabbro

   Gabbro (/ ˈɡæbroʊ / GAB-roh) is a phaneritic (coarse-grained and magnesium- and iron-rich), mafic intrusive igneous rock formed from the slow cooling magma into a holocrystalline mass deep beneath the Earth 's surface. Slow-cooling, coarse-grained gabbro is chemically equivalent to rapid-cooling, fine-grained basalt.

4. Stone spheres of Costa Rica - Wikipedia

   en.wikipedia.org/wiki/Stone_spheres_of_Costa_Rica

   Several stone spheres of the Diquís exhibited at Museo Nacional de Costa Rica. For comparison purpose, the image on the wall shows the diameter of the biggest recorded stone sphere, 2.66 metres (8.7 ft) The spheres range in size from a few centimetres to over 2 metres (6.6 ft) in diameter, and weigh up to 15 tons. [4]

5. List of rock types - Wikipedia

   en.wikipedia.org/wiki/List_of_rock_types

   The following is a list of rock types recognized by geologists.There is no agreed number of specific types of rock. Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe a rock type.

6. Sabu disk - Wikipedia

   en.wikipedia.org/wiki/Sabu_disk

   The artifact, made of schist (a term previously used in Egyptology for weakly metamorphic siltstone [2]), is in the shape of a shallow bowl with a diameter of 61 centimetres (24 in) and a maximum height of 10.6 cm (4.2 in). There is a central hole with a diameter of about 8 cm (3.1 in), which is fitted with a socket whose height corresponds ...

7. Pyramidion of Amenemhat III - Wikipedia

   en.wikipedia.org/wiki/Pyramidion_of_Amenemhat_III

   The pyramidion, carved out of single piece of basalt (often called black granite), is mostly intact apart from a broken corner.With a height of 1.40 metres (4.6 ft) and base length 1.85 metres (6.1 ft), it weighs around 4.5 tonnes (9,900 lb).