CACrown ArchivesThe cinema collection
EN/FR
Search
Menu
Research dossier · General Reference

Sborgite

nesoborate mineral

Cross-disciplinary reference desk with index cards, atlas, dictionary and catalogue
General referenceInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionFeb 25, 2026
Entity authorityQ3951305 ↗
Source-derived summary

Sborgite is a sodium borate mineral with formula Na[B5O6(OH)4]·3H2O. The formula can be written as the oxide formulation, Na2O.5B2O3.10H2O. Sometimes called sodium pentaborate pentahydrate it contains the pentaborate anion, (B5O6(OH)4)−.

Sborgite is colorless with monoclinic crystals. It was named for Umberto Sborgi, (1883–1955), Professor of Chemistry, University of Milan, Italy. Sborgite occurs in Tuscany, Italy and the Furnace Creek district, Death Valley, California, US.

See also

List of minerals

References

Curzio Cipriani (1957). "Un nuovo minerale fra i prodotti boriferi di Larderello". Atti Rend. Accad. Lincei. 22: 519–525.

S. Menchetti and C. Sabelli (1978).

Editorial summary

Begin with the source’s own compact description: “Sborgite” is nesoborate mineral. The dossier treats that line as a proposition to test through Sborgite, nesoborate and mineral, not as a finished interpretation.

Editorial reviewA concise reference frame for defining the subject, testing terminology and identifying the institution closest to the evidence. The current lead gives the account dated anchors—1883, 1955, 1957, 1978—that can be checked directly. The selected authority fields contribute no independent date. For this dossier, Sborgite, nesoborate and mineral is the immediate research focus.
Editorial analysis

Why this record matters

The phrase “nesoborate mineral” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.

Evidence profile

Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Feb 25, 2026. The linked authority identifier is Q3951305. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1883, 1955, 1957 and 1978.

Critical limits

The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

Best used for
  • Subject orientation
  • Search vocabulary
  • Locating named sources
Verify next

The closest primary source, responsible institution and strongest cited specialist reference.

Three-step research path

  1. Establish the record: confirm the title “Sborgite”, its source revision and the description used here.
  2. Expand the search: follow Sborgite primary sources, Sborgite archive and Sborgite research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

  1. Which source most directly establishes the central claim about “Sborgite”?
  2. Which cited source is closest to the event, object or claim?
  3. What terminology or title could unlock a more precise catalogue search?
Subject index

Search terms from this dossier

Source & attribution

This entry incorporates text from “Sborgite” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.