The empirical formula is derived from the mineral's structural (molecular) formula by using the published analysis of the mineral or deriving the analysis using basic rules.
(K,Na) = K0.75 Na0.25
(K,Na,Cs)= K0.6 Na0.3 Cs0.1
The empirical formula was used to calculate the chemical composition in this database.
Example Subject Searches
Example: To find minerals with Si2O7 in the chemical formula try "Si2O7".
Example: "PO4,CO3" finds all minerals with PO4 and CO3 in that order of occurrence.
Example: "PO4" "CO3" finds all minerals with PO4 and CO3 without regard to order of occurrence.