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sodalite
Science; General science
A mineral of the feldspathoid group, crystallizing in the isometric system, with chemical composition Na 4 Al 3 Si 3 O 12 Cl. Its tektosilicate framework, in which half the ...
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.
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 ...
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 , ...
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 ...
pyromorphite
Science; General science
A mineral series in the apatite group, or in the larger grouping of phosphate, arsenate, and vanadate-type minerals. In this series lead (Pb) substitutes for calcium (Ca) of the ...
hemimorphite
Science; General science
A mineral sorosilicate having the composition Zn 4 Si 2 O 7 (OH) 2 · H 2 O; an ore of zinc. It crystallizes in the orthorhombic system, pyramidal class, and thus the prismatic ...
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