How can you identify calcite from FTIR?

Quick answer

calcite is usually reported with a recurring pattern of peaks and functional-group evidence. The most useful approach is to cross-check at least two characteristic peaks before treating it as a match, then verify whether the full spectrum still fits the same material family.

Peak interpretation

Possible materials / groups

Spectrum logic

The logic here is evidence aggregation: repeated literature mentions of calcite, repeated peak positions, and repeated functional-group associations. A strong material hypothesis should still be supported by multiple peaks that agree with each other, not by one headline band alone.

Real-world usage

This page is designed for polymer identification, incoming-material QC, unknown plastic analysis, recycled-content review, and literature-backed interpretation of reference spectra.

Common mistakes

• Calling a material match too early because one famous peak is present.
• Ignoring sample prep, fillers, oxidation, water, or additives that can change the apparent pattern.
• Using literature evidence without checking whether your own sampling mode and spectrum quality are comparable.

Verification advice

Use DSC, GC-MS, or TGA to validate the material hypothesis when the peak pattern is ambiguous or mixed.

Literature behind this page

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  Laboratory Testing of Scheelite Flotation from Raw Ore in Sangdong Mine for Process Development DOI: 10.3390/min10110971
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  Carbonate mineral identification and quantification in sediment matrices using diffuse reflectance infrared Fourier transform spectroscopy DOI: 10.1007/s10311-020-01027-4
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  Yaseen 等 - 2018 - Synthesis of calcium carbonate in alkali solution DOI: 10.1016/j.jssc.2018.03.005
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  Chong 等 - 2014 - Polymorphs Calcium Carbonate on Temperature Reacti DOI: 10.1063/1.4895169
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  Jorda 等 - 2022 - Characterisation of clays from Alicante province ( DOI: 10.1007/s10653-021-00925-y
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  Les amas coquilliers du site Imiwaia I (Canal Beagle, Argentine). Étude des coquilles Mytilus edulis au moyen de la FTIR-ATR DOI: 10.1016/j.anthro.2013.02.004
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  Marsh 等 - 2019 - Influence of clay minerals and associated minerals DOI: 10.1016/j.conbuildmat.2019.116816
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  Direct-on-Filter FTIR Spectroscopy to Estimate Calcite as A Proxy for Limestone ‘Rock Dust’ in Respirable Coal Mine Dust Samples DOI: 10.3390/min11090922
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  Multi-Technique Characterization of Pictorial Organic Binders on XV Century Polychrome Sculptures by Combining Micro- and Non-Invasive Sampling Approaches DOI: 10.3390/app11178017
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  Formation and Inhibition of Calcium Carbonate Crystals under Cathodic Polarization Conditions DOI: 10.3390/cryst10040275