what is the chemical formula of basalt and mica?

Answer 1

Mica is silicon dioxide, in a crystalline form similar to that of graphite -- flat planes of hexagonal rings interlinked to each other in a vast planar network.

Basalt is a little more difficult to describe -- it is a mixture of minerals. Here's what the Wikipedia has to say about it:

"Geochemistry
"Basalt compositions are rich in MgO and CaO and low in SiO2 and Na2O plus K2O relative to most common igneous rocks, consistent with the TAS classification.

"Basalt generally has a composition of 45-55 wt% SiO2, 2-6 wt% total alkalis, 0.5-2.0 wt% TiO2, 5-14 wt% FeO and 14 wt% or more Al2O3. Contents of CaO are commonly near 10 wt%, those of MgO commonly in the range 5 to 12 wt%.

"High alumina basalts have aluminium contents of 17-19 wt% Al2O3; boninites have magnesium contents of up to 15% MgO. Rare feldspathoid-rich mafic rocks, kin to alkali basalts, may have Na2O plus K2O contents of 12% or more.

"MORB basalt, a tholeiite particularly low in total alkalis and in incompatible trace elements, has a flat REE pattern normalised to mantle or chondrite values. In contrast, alkali basalts have normalized patterns highly enriched in the light REE, and with greater abundances of the REE and of other incompatible elements.

"Isotope ratios of elements such as strontium, neodymium, lead, hafnium, and osmium in basalts have been much-studied, so as to learn about evolution of the Earth's mantle. Isotopic ratios of noble gases, such as 3He/4He, are also of great value: for instance, ratios for basalts range from 6 to 10 for mid-ocean ridge tholeiite (normalized to atmospheric values), but to 15-24+ for ocean island basalts thought to be derived from mantle plumes."

Answer 2

Urea is an organic compound with the chemical formula (NH2)2CO. Urea is also known as carbamide, especially in the recommended International Nonproprietary Names (rINN) in use in Europe. For example, the medicinal compound hydroxyurea (old British Approved Name) is now hydroxycarbamide. Other names include carbamide resin, isourea, carbonyl diamide, and carbonyldiamine. It was the first organic compound to be artificially synthesized from inorganic starting materials, thus dispelling the concept of vitalism. Urea is highly soluble in water and is therefore an efficient way for the human body to expel excess nitrogen. Due to extensive hydrogen bonding with water (up to six hydrogen bonds may form[citation needed], two from the oxygen atom and one from each hydrogen), it is very soluble and thus is also a good fertilizer. The urea molecule is planar and retains its full molecular point symmetry, due to conjugation of one of each nitrogen's P orbital to the carbonyl double bond. Each carbonyl oxygen atom accepts four N-H-O hydrogen bonds[citation needed], a very unusual feature for such a bond type. This dense (and energetically quite favourable) hydrogen bond network is probably established at the cost of efficient molecular packing: the structure is quite open, the ribbons forming tunnels with square cross-section.