Top 10 minerals facts Selected as the most interesting among geology related questions in Geology quiz What was graphite believed to be a form of?Lead. When large deposit of graphite was found in the 16th century in England, it was thought to be a form of lead. In many languages, the word for pencil literally means lead pen. (German Bleistift, Polish ołówek, Arabic قلم رصاص) Created by: Kasiawriting facts » Where do you have the best chance to find a natural diamond?Near the volcano. It is sometimes mistakenly believed that diamonds are made from coals. High pressure and heat is required for the formation of diamonds from carbons but these carbons are not the ones that form coal. Diamonds are formed deep under the surface and are brought up during outbreaks of volcanoes.Created by: Monica Stillergemstones facts » Where are such formations usually found?In deserts. Desert rose is the colloquial name given to rosette formations of crystal clusters of gypsum or baryte which contain abundant included sand grains. Desert roses occur when the crystals form in arid sandy conditions, such as the evaporation of a shallow salt basin.Created by: Carlos Saltodeserts of North Africa facts » What rock is this?Granite is a type of felsic intrusive igneous rock. It is granular and phaneritic in texture. The rock mainly consist of quartz, feldspar, mica, and amphibole minerals.Created by: KYRTAPSgeology facts » Which of the following is not an allotropic variety of coal?Anthracite. An allotropy is a phenomenon of appearing, in the same state of aggregation, of all sorts varieties of the same chemical element, differing in physical properties and chemical. Coal is appearing mainly in the form of diamond, graphite, fullerene and graphene. Anthracite is simply a variety of the hard bituminous coal.Created by: Paweł Kołodziejczykchemistry facts » Which country is the global leader in aluminium production?China. People's Republic of China is the top producer of aluminium with almost a one-fifth world share. It heavily outranks other countries, producing five times as much as the second place holder - Russia.Created by: Kasiacountry records facts » Which type of a coal is the youngest?Lignite (brown coal). Coal forms when the dead plant matter is converted into peat, which in turn is converted into lignite, then sub-bituminous coal, then bituminous coal, and lastly anthracite.Created by: Kasianatural resources facts » What colour is emerald colour a shade of?Green. The name derives from the Greek smaragdos (as well as Lat. smaragdus - green). It refers to the characteristic colour of emerald stones.Created by: Paweł Kołodziejczykcolors facts » What colour is sapphire colour a shade of?Blue. The name of the colour comes from sapphire, a blue variety of the corundum.Created by: Paweł Kołodziejczykcolors facts » What mineral is a heliodor gemstone a variety of?Beryl. Heliodor is a yellow transparent variety of beryllium (emerald and aquamarine are also varieties of beryllium). The name derives from the Greek word helios = sun (sun-god) and doron = gift ("gift of the Sun").Created by: Paweł Kołodziejczyknames facts » Play geology quiz and see all the questions.