Geology Niggli Value Alk Calculator
Declared Niggli alk=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 alk describes an independently computed alkali group within an adopted molar normalization.
Niggli alk describes an independently computed alkali group within an adopted molar normalization.1
The selected grouping convention determines the numerator. Use this tool to calculate the stated observation or conditional model from supplied measurements.
When to use Geology Niggli Value Alk 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 Alk 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 Alk divided by the four-group total. No oxide-to-mole conversion, oxidation-state assignment or group construction is added.
NiggliValue=100×Alk/(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": 40
}
}
}Limitations and assumptions
The selected grouping convention determines the numerator. 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 Niggli Value Fm Calculator to examine a related aspect: Niggli fm describes an independently computed ferromagnesian group within an adopted molar normalization.
Use Geology Niggli Value C Calculator where its separate inputs and scope apply: Niggli c describes an independently computed calcium group within an adopted molar normalization.
References
-
Geology Niggli Value Alk Calculator — tool.io
Similar or alternative tools
- Geology Niggli Value Fm Calculator
Niggli fm describes an independently computed ferromagnesian group within an adopted molar normalization.
- Geology Niggli Value C Calculator
Niggli c describes an independently computed calcium group within an adopted molar normalization.