General science

General science

A variety of science subjects concerning the fundamental knowledge about different aspects of our world and their underlying principles.

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General science

Nepheline

Science; General science

A mineral of variable composition: in its purest state, NaAlSiO 4 ; often nearly Na 3 K(AlSiO 4 ) 4 ; but generally (Na,K,□,Ca,Mg,Fe 2+ ,Mn,Ti) 8 (Al,Si,Fe 3+ ) 16 O 32 , where □ represents ...

Fluorite

Science; General science

A mineral of composition CaF 2 and an important structure type with space group Fm3m, cell edge = 0.546 nm. The fluorite structure type is written RX 2 , where the R cations are in cubic ...

Muscovite

Science; General science

A mineral of the mica group with an ideal composition of KAl 2 (AlSi 3 )O 10 (OH) 2 . Sometimes it is referred to as a white mica or potash mica.

Turquoise

Science; General science

A mineral of composition CuAl 6 (PO 4 ) 4 (OH) 8 · 5H 2 O in which considerable ferrous ion (Fe 2+ ) may substitute for copper. Ferric ion (Fe 3+ ) may also substitute for part or all of the ...

A mineral of the feldspathoid group, crystallising in the isometric system, with chemical composition Na 4 Al 3 Si 3 O 12 Cl. Its tektosilicate framework, in which half the tetrahedrally coordinated ...

Lepidolite

Science; General science

A mineral of variable composition which is also known as lithium mica and lithionite, K 2 (Li,Al) 5−6 - (Si 6−7 ,Al 2−1 )O 20−21 (F,OH) 3−4 . Rubidium (Rb) and cesium (Cs) may replace potassium (K); ...

Gem

Science; General science

A mineral or other material that has sufficient beauty for use as personal adornment and has the durability to make this feasible. With the exception of a few materials of organic origin, such as ...