ludwigite

Ludwigite name assignment

Record the authority and analytical evidence behind the species assignment.

1. Does the identification denote ludwigite itself, a ludwigite-group phase or an unresolved ludwigite-vonsenite composition? definition
2. Which mineral reference and specimen analyses support the assigned name? provenance

Series and substitution limits

Make the applicable naming rules and their evidential requirements explicit.

1. Which compositional or site-occupancy criteria distinguish this grain from vonsenite and other plausible ludwigite-group species? boundary
2. Are the chemistry and occupancy data sufficient to apply those criteria, or must the identification remain broader? action

Boron and cation balance

Record measured constituents, analytical closure and formula normalization.

1. Were B, Mg and Fe measured on the identified ludwigite phase, and what detection limits and uncertainties apply? measurement
2. What normalization basis was used, and were boron or oxygen values measured, assumed or calculated? measurement

Iron allocation and zoning

Track iron-valence assignments, substituting cations and within-grain variation.

1. Was Fe2+/Fe3+ determined independently or inferred from charge balance, and how does that affect the species assignment? measurement
2. Do grain maps or repeated analyses reveal zoning, substituting cations or unresolved inclusions behind the reported composition? measurement

Pattern and cell consistency

Link diffraction results to analyzed grains and named reference material.

1. Which reflections, refined cell parameters and fit residuals support a ludwigite-compatible structure? measurement
2. Could overlapping peaks from associated minerals or another group member explain the apparent match? boundary

Habit and property attribution

Keep observations of ludwigite separate from properties of its matrix and intergrowths.

1. What habit, hardness, streak and optical behaviour were observed on confirmed ludwigite grains? measurement
2. If density or magnetic response was measured, what evidence excludes an effect dominated by associated phases? boundary

Host and locality evidence

Ludwigite is reported typically from magnesian iron skarn and contact-metamorphic deposits; record whether the specimen context is demonstrated or only labelled. Reference: [Handbook of Mineralogy](https://www.handbookofmineralogy.org/pdfs/ludwigite.pdf).

1. Which collection records establish the locality, host rock and position of the ludwigite-bearing sample? provenance
2. What observations support the proposed formation setting, and which parts remain inferred? provenance

Phase fraction and texture

Distinguish intact ludwigite from inclusions, adjacent phases and replacement material.

1. What fraction of the specimen is ludwigite, and how were fine intergrowths included in the estimate? measurement
2. Which textures demonstrate replacement or alteration, and which merely show minerals in contact? boundary

Representative preparation

Record preparation choices and their effects on the sample and its interpretation.

1. Which sampling and separation method yields representative ludwigite without selectively losing fine grains or retaining matrix? action
2. What particle-release and associated-mineral evidence should govern cutting, grinding or handling this specimen? action

Use constraints and state changes

Require specimen-specific evidence before inferring performance from the mineral name.

1. What phase-purity, composition and grain-integrity requirements must this ludwigite specimen meet for the proposed use? action
2. What evidence establishes its response to the proposed heating, chemical treatment or storage conditions? measurement

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 ludwigite 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 ludwigite 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 ludwigite 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 ludwigite 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 ludwigite 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 ludwigite this model covers, and on what evidence? provenance