hoelite

Natural anthraquinone phase

Hoelite is identified as natural 9,10-anthraquinone, C14H8O2, in [Jehlička et al. (2007)](https://www.sciencedirect.com/science/article/abs/pii/S138614250700087X). Record the evidence connecting the examined material to that identity.

1. What evidence identifies 9,10-anthraquinone rather than another compound sharing its elemental formula? definition
2. Does the identification describe an isolated crystal, a mapped region or the bulk specimen? boundary

Evidence for applying the mineral name

Record occurrence provenance independently of chemical identification, and label synthetic comparison material explicitly.

1. What collection or preparation record establishes whether this material is an occurrence specimen or a synthetic reference? provenance
2. Which authoritative mineral record supports applying the name hoelite to this occurrence? boundary
3. Which chemical identifiers refer to the molecular compound, and which identifiers refer specifically to the mineral? definition

Reference spectrum discrimination

Comparative Raman work on hoelite and kladnoite provides a relevant identification resource; retain the actual reference spectrum and acquisition conditions used. See [Jehlička et al. (2007)](https://www.sciencedirect.com/science/article/abs/pii/S138614250700087X).

1. Which measured bands support hoelite, and which discriminate it from kladnoite or other candidate phases? measurement
2. Could fluorescence, substrate contributions or irradiation-induced change explain the apparent match? measurement

Diffraction corroboration

Use a verified hoelite or structurally equivalent anthraquinone reference to assess diffraction; record whether the reference material was natural or synthetic.

1. Which diffraction observations match the selected reference, and which remain unexplained? measurement
2. Are the data sufficient to identify one crystalline phase or only a mixture containing a candidate phase? boundary
3. Which observed crystal dimensions and habits support selecting material for confirmatory diffraction? action

Coal-fire sublimate context

Hoelite has been studied among sublimation products on self-ignited coal heaps. This is a documented occurrence context, not a compulsory origin for every specimen. See [Jehlička et al. (2007)](https://www.sciencedirect.com/science/article/abs/pii/S138614250700087X).

1. Where within the deposit was the specimen collected, and what substrate carried the crystals? provenance
2. Was burning or thermal activity directly observed, historically documented or inferred? provenance

Formation pathway confidence

Record whether vapour transport and deposition are supported for this occurrence, without inferring formation temperature from the mineral name.

1. What observations support vapour deposition rather than another route to the observed crystals? provenance
2. Which temperatures, gases or deposition conditions were actually measured, and at what location and time? measurement
3. Could reagent contamination or later handling account for the anthraquinone detected? boundary

Mixed deposit accounting

Record phase associations and spatial boundaries so measurements can be attributed to hoelite, its substrate or a mixture.

1. Which regions contain confirmed hoelite, and how were their boundaries established? measurement
2. Which associated materials could contribute to the same spectrum, diffraction pattern or thermal signal? boundary

Purity claim support

Treat purity as a measured property of a defined sample; distinguish detection, estimated abundance and validated quantitative analysis.

1. What method, uncertainty and sampled mass support the reported hoelite fraction? measurement
2. Did picking, washing or extraction preferentially remove hoelite or associated substances? provenance
3. What additional sampling would resolve heterogeneity without unnecessarily consuming the specimen? action

Response to intervention

Document specimen behaviour under actual analytical and storage conditions rather than assuming that purified anthraquinone constants establish safe operating conditions.

1. What changes in crystal appearance, mass or spectrum occurred after heating, illumination, vacuum exposure or mounting? measurement
2. If a thermal event was observed, what evidence distinguishes melting, sublimation, decomposition or loss of another constituent? measurement
3. Which demonstrated conditions preserve this specimen's morphology and analytical signature? action

Applicable handling evidence

Link current chemical safety information to a verified identity and assess associated material separately; the mineral name alone does not establish a mixture's classification.

1. Which current safety source and jurisdiction apply to the identified anthraquinone component and the proposed operation? provenance
2. Which contaminants or associated phases change the handling requirements for this specimen? boundary
3. Can the identification question be resolved by examining an existing fragment before consuming additional crystals? 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 hoelite 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 hoelite 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 hoelite 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 hoelite this model covers, and on what evidence? provenance