Use this geological calculation for a transparent first-pass interpretation of measured rock, soil, fluid, well, stratigraphic, isotopic, geophysical, or seismic data under an explicitly selected model.

C0

Initial melt concentration in ppm.

F

Fraction of liquid remaining F, between 0 (exclusive) and 1.

D

Bulk partition coefficient D (dimensionless).

Rayleigh fractional crystallization C_l = C_0 * F^(D-1) with F the fraction of liquid remaining and D the bulk partition coefficient; concentrations in ppm. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Cl

Residual liquid concentration in ppm.

• Classification diagrams and geochemical ratios require appropriate normalization, oxidation-state treatment, volatile basis, analytical quality, alteration screening, mineral or whole-rock context, and a composition within the method's calibration domain.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Compare independent measurements and models, retain units and analytical metadata, propagate uncertainty, and validate interpretations against logs, cores, maps, laboratory data, or field observations.

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