LithoMap

Mineral identification comparison

Epidote vs. olivine: how to tell them apart

Epidote and olivine can both be yellow-green to dark green and have similar hardness. Epidote commonly forms pistachio-green prismatic or granular material with one perfect cleavage; olivine is typically olive-green, granular, and poorly cleaved.

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Radiating dark green-black epidote crystals with minor clear to white quartz
EpidoteCalcium aluminum iron sorosilicate · Ca₂(Al,Fe)₃(SiO₄)₃(OH)Photo: Darla Sondrol · CC0 1.0
Yellow-green olivine crystal specimen in dark matrix
OlivineSilicate mineral groupPhoto: Robert M. Lavinsky · CC BY-SA 3.0
Quick answer

The most useful distinction

Look for cleavage and setting. One repeated flat cleavage in pistachio-green prismatic material favors epidote; rounded or sugary olive-green grains with poor cleavage favor olivine.

Side-by-side evidence

Epidote and Olivine comparison table

PropertyEpidoteOlivineHow to use it
Typical colorPistachio, yellow-green, or dark greenOlive, yellow-green, or brownish greenColor tone helps only when combined with texture.
CleavageOne perfect directionPoor cleavage; commonly uneven or conchoidal fractureRepeated flat surfaces favor epidote.
HabitPrismatic, bladed, radiating, or granularGranular, rounded, or short blocky crystalsElongate epidote contrasts with typical olivine grains.
Geologic settingMetamorphic and hydrothermally altered rocksMafic and ultramafic igneous rocks and mantle-derived materialContext is highly useful but not definitive alone.
Field sequence

A practical identification sequence

  1. 1

    Inspect a fresh surface because both minerals weather readily.

  2. 2

    Look for a repeated flat cleavage direction.

  3. 3

    Compare prismatic versus granular crystal shape.

  4. 4

    Use the mapped rock type and associated minerals as supporting evidence.

Limits and cautions

Where the distinction gets difficult

  • Alteration can replace olivine with serpentine, iddingsite, or other minerals.
  • Massive epidote-chlorite mixtures may obscure cleavage.
  • Do not identify either mineral solely from green color.

Use several independent observations. This comparison supports preliminary field identification, not laboratory confirmation, appraisal, proof of origin, or collecting permission.

Common questions

Epidote vs. olivine FAQ

Which mineral is harder?

Their hardness ranges overlap; both can scratch glass in suitable fresh grains.

Does olivine have cleavage?

Olivine has poor cleavage that is usually not prominent in hand specimen. Epidote has one much better cleavage direction.

Can both occur in igneous rocks?

Yes, but olivine is commonly primary in mafic rock while epidote more often records metamorphism or hydrothermal alteration.

Source basis

Authoritative sources

LithoMap wrote this comparison in original language from the physical properties and geological concepts supported by these public scientific references.

Editorial review: September 17, 2026.

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