10 most difficult minerals riddles A list of minerals related questions that are most often answered incorrectly Geology quiz 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.hard 42% diamonddiamond11%graphitegraphite11%fullerenefullerene34%anthraciteanthracite42%Created by: Paweł Kołodziejczyk. Statistics based on 2961 answers in 2 languages »chemistry riddles » 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").hard 49% TopazTopaz25%RubyRuby12%BerylBeryl49%TalcTalc12%Created by: Paweł Kołodziejczyk. Statistics based on 4253 answers in 2 languages »gemstones riddles » 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.hard 51% ChinaChina51%CanadaCanada18%United StatesUnited States11%RussiaRussia18%Created by: Kasia. Statistics based on 12196 answers in 2 languages »natural resources riddles » 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.hard 54% near the volcanonear the volcano54%in the coal minein the coal mine31%in the silver minein the silver mine7%at the beachat the beach5%Created by: Monica Stiller. Statistics based on 6031 answers in 4 languages »nature riddles » 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.hard 57% lignite (brown coal)lignite (brown coal)57%graphitegraphite14%bituminous coalbituminous coal12%anthraciteanthracite15%Created by: Kasia. Statistics based on 6710 answers in 2 languages »geology riddles » 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.average 60% redred10%greengreen60%blueblue23%purplepurple5%Created by: Paweł Kołodziejczyk. Statistics based on 3375 answers in 2 languages »colors riddles » What colour is sapphire colour a shade of?Blue. The name of the colour comes from sapphire, a blue variety of the corundum.average 60% redred8%greengreen19%blueblue60%purplepurple10%Created by: Paweł Kołodziejczyk. Statistics based on 3478 answers in 2 languages »colors riddles » 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) average 64% leadlead64%mercurymercury7%ironiron11%chalkchalk16%Created by: Kasia. Statistics based on 15698 answers in 2 languages »writing riddles » 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.easy 74% in cavesin caves8%in coal minesin coal mines3%in desertsin deserts74%in extinct volcanoesin extinct volcanoes14%Created by: Carlos Salto. Statistics based on 13155 answers in 2 languages »deserts of North Africa riddles » 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.easy 79% gneissgneiss7%granitegranite79%halitehalite4%basaltbasalt8%Created by: KYRTAPS. Statistics based on 10093 answers in 2 languages »geography riddles » Play geology quiz and see all the questions.