Spectral indices for

Mineral Exploration

Identify mineral deposits, map hydrothermal alteration zones, and discriminate lithological units in arid and bare-ground regions. Geological indices target diagnostic absorption features in the shortwave infrared spectrum where different minerals produce unique signatures from electronic transitions and vibrational overtones.

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Recommended indices (6)

These indices are most commonly used for mineral exploration. Click any index to see the full formula, sensor-specific implementations, and code samples.

FOX Geology

Ferric Oxides Index

Geological index for detecting ferric oxide concentrations in rocks and soils. Useful for identifying iron-rich minerals and oxide formations in geological mapping and mineral exploration.

NIR / Red

AKP Geology

Alunite/Kaolinite/Pyrophylite Index

Geological index designed to identify alunite, kaolinite, and pyrophylite minerals. These clay minerals are indicators of hydrothermal alteration and are valuable for mineral exploration and geological mapping.

(SWIR1 + SWIR3) / SWIR2

ALT Geology

Alteration Index

Geological index used to identify areas of hydrothermal alteration and mineral deposits. The ratio highlights areas where clay minerals and hydroxyl-bearing minerals are present, indicating potential alteration zones.

SWIR3 / SWIR5

FEI Geology

Ferrous Iron Index

Geological index for detecting ferrous iron (Fe2+) concentrations in rocks and soils. Combines SWIR and visible-NIR ratios to identify iron-bearing minerals and geological formations.

(SWIR5 / Red + NIR1 / Green)

GOS Geology

Gossan Index

Geological index for detecting gossan formations - weathered, oxidized iron-bearing rocks that form at the surface above sulfide mineral deposits. Essential for mineral exploration and identifying potential ore deposits.

SWIR4 / Red

AMP Geology

Amphibole Index

Geological index for detecting amphibole minerals in rocks. Amphiboles are important rock-forming minerals that provide insights into geological processes and mineral composition.

SWIR1 / SWIR2

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