eskolaite

Composition and structure agreement

Eskolaite has ideal composition Cr2O3; an assignment should retain both chemical and structural evidence. Reference: [Handbook of Mineralogy](https://rruff.info/doclib/hom/eskolaite.pdf).

1. Do chemistry and diffraction measurements refer to the same grain or demonstrably equivalent material? measurement
2. Which observed features support eskolaite, and which conflict with that assignment? definition

Origin-qualified naming

Record whether the object is a natural specimen, synthetic reference material or material of unresolved origin.

1. What collection or manufacturing record establishes the specimen's origin? provenance
2. Is eskolaite naming a mineral grain, an identified phase or an entire commercial material? boundary

Substitution versus contamination

A published natural analysis includes V and Fe alongside Cr; extra elements require grain-scale interpretation rather than automatic rejection or acceptance. Reference: [Handbook of Mineralogy](https://rruff.info/doclib/hom/eskolaite.pdf).

1. Which non-Cr elements are reproducibly measured within eskolaite grains? measurement
2. Do mapping and analytical resolution support lattice substitution or an unresolved inclusion? boundary

Phase-resolved abundance

Keep mineral phase fraction distinct from elemental chromium concentration and commercial purity labels.

1. What eskolaite fraction was measured, on what basis and with what detection limit? measurement
2. Which host phases, coatings or inclusions contribute to the reported bulk composition? boundary

Reference pattern fit

Retain the reference, measured pattern, fit quality and unexplained reflections rather than only a software-generated phase label.

1. Which eskolaite reference was used, and under what measurement conditions? provenance
2. Are unmatched reflections explained by associated phases, or do they challenge identification? measurement

Screening with specimen context

Record whether observations concern an exposed eskolaite grain, a polished section or the surrounding aggregate.

1. Were colour, streak and hardness observed on identified eskolaite rather than its host? measurement
2. Would a scratch or streak test consume material needed for a more decisive analysis? action

Documented occurrence

Reported settings include chromium-rich metamorphic rocks and transported pebbles; distinguish collection setting from inferred formation setting. Reference: [Handbook of Mineralogy](https://rruff.info/doclib/hom/eskolaite.pdf).

1. Which field record or specimen history supports the stated locality? provenance
2. Was the material collected in place or after transport, and what does that leave unresolved about its source? boundary

Host contact interpretation

Separate observed inclusions, intergrowths and rims from inferred formation sequences.

1. Which identified minerals contact or enclose the eskolaite grain? measurement
2. What textural evidence supports a proposed growth or replacement sequence? provenance

Representative minimal sampling

Choose material that answers the analytical question while preserving diagnostic contacts and documented reference material.

1. Can the proposed measurement isolate eskolaite at the observed grain size? action
2. Which textures or provenance-bearing features would cutting, polishing or powdering destroy? boundary

Condition-specific action review

Require relevant evidence before assigning handling rules or predicting the result of heating or chemical treatment.

1. What specimen-specific composition and applicable guidance support the proposed handling method? action
2. What temperature, atmosphere or reagents are proposed, and what evidence addresses possible phase or chromium-speciation changes? action

Check these first

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these check these first hold for the sense of eskolaite this model covers, and on what evidence? provenance

Identifiers and schemes

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these identifiers and schemes hold for the sense of eskolaite this model covers, and on what evidence? provenance

Real-world use

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these real-world use hold for the sense of eskolaite this model covers, and on what evidence? provenance

Typical measurements

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these typical measurements hold for the sense of eskolaite this model covers, and on what evidence? provenance

Failure modes and hazards

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these failure modes and hazards hold for the sense of eskolaite this model covers, and on what evidence? provenance

Neighbouring kinds and how to tell them apart

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these neighbouring kinds and how to tell them apart hold for the sense of eskolaite this model covers, and on what evidence? provenance