Geology Normative Color Index Calculator
Actual independently selected mafic normative mineral color-index percentage of complete same-basis independently computed norm. Weight/volume basis and mineral assignment external, not compute full CIPWnorm or actual observed mineral mode.
Description
Normative color index depends on which normative mineral components the caller selects.
Normative color index depends on which normative mineral components the caller selects.1
The complete normative inventory supplies the percentage denominator. Use this tool to calculate the stated observation or conditional model from supplied measurements.
When to use Geology Normative Color Index 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 Normative Color Index Calculator and understand its results
- Establish the sample and coordinate basis, matching units, calibration source and applicable model assumptions.
- Enter actualCompleteNormativeMineralAmounts, independentlySelectedComponentFlags, using the field meanings and rules below, then run the tool.
- Read result.observedSelectedNormativePercent. 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 |
|---|---|---|---|
| actualCompleteNormativeMineralAmounts | Actual complete normative mineral amounts | list of number | Required |
| independentlySelectedComponentFlags | Independently selected component flags; binary 0/1 in the order documented below | list of number | Required |
Supply a nonempty complete normative mineral-amount list and aligned binary selected-component flags. All amounts must be nonnegative and their total positive. Return 100 times selected total divided by complete total. The selected components are caller-defined; no CIPW norm or mineral assignment is computed.
selectedNormativePercent=100×Σ(amount_i×selectedFlag_i)/Σamount_i 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.observedSelectedNormativePercent | Observed Selected Normative Percent; use the units, sign convention and calculation stated above | number |
{
"input": {
"actualCompleteNormativeMineralAmounts": [
2,
3,
5
],
"independentlySelectedComponentFlags": [
1,
0,
1
]
},
"output": {
"result": {
"observedSelectedNormativePercent": 70
}
}
}Limitations and assumptions
The complete normative inventory supplies the percentage denominator. 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 Differentiation Index Di Calculator to examine a related aspect: Differentiation index depends on the caller's selected normative mineral components.
Use Geology Niggli Value Fm Calculator where its separate inputs and scope apply: Niggli fm describes an independently computed ferromagnesian group within an adopted molar normalization.
References
-
Geology Normative Color Index Calculator — tool.io
Similar or alternative tools
- Geology Differentiation Index Di Calculator
Differentiation index depends on the caller's selected normative mineral components.
- Geology Niggli Value Fm Calculator
Niggli fm describes an independently computed ferromagnesian group within an adopted molar normalization.