Geology Peralkalinity Index Calculator
Molar(Na2O+K2O)/Al2O3, independently matched molar masses not weight sum. Caller independently establishes matching units, evidence, method edition and applicability; output is not compliance, diagnosis, work-safety approval, geological identity or validated hazard prediction.
Description
A peralkalinity index compares sodium-plus-potassium oxide moles with aluminum oxide moles.
A peralkalinity index compares sodium-plus-potassium oxide moles with aluminum oxide moles.1
Converting masses to oxide moles first is necessary because a mass ratio has a different chemical meaning. Use this tool to calculate peralkalinity index from the supplied measurements and assumptions.
When to use Geology Peralkalinity Index Calculator
Use this tool to calculate peralkalinity index from the supplied measurements and assumptions. Establish the measurement units, sampled interval, calibration or model edition and geological assumptions before entering data.
How to use Geology Peralkalinity Index Calculator and understand its results
- Establish the measurement units, sampled interval, calibration or model edition and geological assumptions before entering data.
- Enter naKAlOxideMasses, matchedMolarMasses, using the field meanings and rules below, then run the tool.
- Read peralkalinity. Interpret the fields using their units, signs and evidence conventions below.
- If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| naKAlOxideMasses | Na k al oxide masses | list of number | Required |
| matchedMolarMasses | Matched molar masses | list of number | Required |
Enter exactly three nonnegative oxide masses in Na2O,K2O,Al2O3 order and three matching positive molar masses. Convert each mass to moles and require positive aluminum-oxide moles. Divide sodium-plus-potassium oxide moles by aluminum oxide moles; no oxide analysis normalization is performed.
index=(massNa/MNa+massK/MK)/(massAl/MAl) Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| peralkalinity | Peralkalinity; follow the units, sign, ordering and evidence convention stated above | number |
{
"input": {
"naKAlOxideMasses": [
2,
3,
4
],
"matchedMolarMasses": [
2,
3,
2
]
},
"output": {
"peralkalinity": 1
}
}Limitations and assumptions
Converting masses to oxide moles first is necessary because a mass ratio has a different chemical meaning. Interpretation depends on the units, sampling scope and exact model described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.
Alternative or Complementary methods
Use Geology Alumina Saturation Index Asi Calculator for this related task: An aluminum saturation index compares aluminum oxide moles with corrected calcium, sodium and potassium oxide moles.
Use Geology Nb Ta Anomaly Calculator when its separate inputs and assumptions fit the question: A normalized niobium or tantalum anomaly compares each element with a neighboring-element baseline.
References
-
Geology Peralkalinity Index Calculator — tool.io
Similar or alternative tools
- Geology Alumina Saturation Index Asi Calculator
An aluminum saturation index compares aluminum oxide moles with corrected calcium, sodium and potassium oxide moles.
- Geology Nb Ta Anomaly Calculator
A normalized niobium or tantalum anomaly compares each element with a neighboring-element baseline.