hafnon

Hafnon-zircon boundary

Require domain-level Hf and Zr measurements and an explicit naming authority.

1. Which authoritative compositional rule separates hafnon from zircon, including compositions close to the boundary? definition
2. What atomic Hf/(Hf + Zr) and uncertainty were measured in the domain being named? measurement

Composition-structure agreement

Associate structural measurements with the same material sampled for chemistry.

1. Which diffraction or complementary structural observations support the hafnon assignment? measurement
2. Could the apparent composition instead come from unresolved zircon, hafnium oxide or other intergrown phases? boundary

Domain representativeness

Record whether an analysis represents a core, rim, inclusion-free domain or mixed volume.

1. How do Hf and Zr vary between the grain core, rim and other resolved domains? measurement
2. Does the name hafnon apply to the whole grain, selected domains or only a separated fraction? boundary

Constituent attribution

Require evidence before assigning minor constituents to the hafnon structure.

1. Which minor elements are detected, at what concentrations and detection limits? measurement
2. What evidence distinguishes structural substitution from inclusions, surface contamination or analytical overlap? boundary

Disorder and history

Distinguish observations of disorder from unverified explanations of its cause.

1. What diffraction peak shapes or other observations quantify structural disorder in this specimen? measurement
2. What evidence links its condition to alteration, irradiation, heating or preparation? provenance

Reference transfer

Evaluate whether a published or synthetic-reference property is applicable to the specimen.

1. What density, optical or thermal measurements are available, with units, conditions and measured-versus-calculated status? measurement
2. Do differences in Zr content, secondary phases or structural condition prevent applying the reference value? boundary

Origin-supported identity

Link each identity claim to an accessioned specimen or documented synthetic batch.

1. Which locality, collection accession or synthesis record identifies the material examined? provenance
2. Which claims rely on natural hafnon and which rely on a synthetic analogue? boundary

Justified specimen intervention

Record the evidential benefit, material consumed and handling basis for a proposed test.

1. Which next test best resolves the hafnon assignment, and how much material or spatial context would it consume? action
2. What specimen-specific dust, contaminant or radiological evidence determines preparation and storage requirements? 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 hafnon 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 hafnon 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 hafnon 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 hafnon 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 hafnon 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 hafnon this model covers, and on what evidence? provenance