Geology Niggli Value Fm Calculator
Declared Niggli fm=100group-equivalent moles/Σ(al+fm+c+alk). Oxide molar conversions, Feoxidation and grouping independently performed under actual Niggliconvention; not raw wt%normalization or full Niggli mineral analysis.
Description
Niggli fm describes an independently computed ferromagnesian group within an adopted molar normalization.
Niggli fm describes an independently computed ferromagnesian group within an adopted molar normalization.1
Group construction precedes the percentage calculation. Use this tool to calculate the stated observation or conditional model from supplied measurements.
When to use Geology Niggli Value Fm Calculator
Use this tool to calculate the stated observation or conditional model from supplied measurements. Establish the sample and coordinate basis, matching units, calibration source and applicable model assumptions.
How to use Geology Niggli Value Fm Calculator and understand its results
- Establish the sample and coordinate basis, matching units, calibration source and applicable model assumptions.
- Enter independentlyComputedAlEquivalentMoles, independentlyComputedFmEquivalentMoles, independentlyComputedCaEquivalentMoles, independentlyComputedAlkEquivalentMoles, using the field meanings and rules below, then run the tool.
- Read result.conditionalNiggliValue. Interpret each field using the units, signs and evidence rules below.
- If input validation fails, correct the reported field and run again. Before applying a successful result, check the stated reference scope, units, assumptions and any retained unknown evidence.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| independentlyComputedAlEquivalentMoles | Independently computed al equivalent moles | number | Required |
| independentlyComputedFmEquivalentMoles | Independently computed fm equivalent moles | number | Required |
| independentlyComputedCaEquivalentMoles | Independently computed ca equivalent moles | number | Required |
| independentlyComputedAlkEquivalentMoles | Independently computed alk equivalent moles | number | Required |
Supply four independently computed nonnegative equivalent-mole group amounts in Al, Fm, Ca and Alk order, with positive total. Return 100 times group Fm divided by the four-group total. No oxide-to-mole conversion, oxidation-state assignment or group construction is added.
NiggliValue=100×Fm/(Al+Fm+Ca+Alk) Apply the field units and exact ordering, boundary and evidence rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Structured result containing the calculation or selected reference fields below | object |
| result.conditionalNiggliValue | Conditional Niggli Value; use the units, sign convention and calculation stated above | number |
{
"input": {
"independentlyComputedAlEquivalentMoles": 1,
"independentlyComputedFmEquivalentMoles": 2,
"independentlyComputedCaEquivalentMoles": 3,
"independentlyComputedAlkEquivalentMoles": 4
},
"output": {
"result": {
"conditionalNiggliValue": 20
}
}
}Limitations and assumptions
Group construction precedes the percentage calculation. Results depend on the independently established measurement basis and the exact model assumptions above.
Every listed input requires an explicit value. Unexpected fields, incorrect value types, nonfinite numbers and sparse numeric arrays fail validation; tool-specific bounds and alignment rules apply as described above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful calculation that reports a false comparison or retains unknown evidence.
Alternative or Complementary methods
Use Geology Normative Color Index Calculator to examine a related aspect: Normative color index depends on which normative mineral components the caller selects.
Use Geology Differentiation Index Di Calculator where its separate inputs and scope apply: Differentiation index depends on the caller's selected normative mineral components.
References
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Geology Niggli Value Fm Calculator — tool.io
Similar or alternative tools
- Geology Normative Color Index Calculator
Normative color index depends on which normative mineral components the caller selects.
- Geology Differentiation Index Di Calculator
Differentiation index depends on the caller's selected normative mineral components.