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Brookite: Measurement, Occurrence and associations & Overview

Brookite is the orthorhombic variant of titanium dioxide (TiO2), which occurs in four known natural polymorphic forms (minerals with the same composition but different structure). The other three of these forms are akaogiite (monoclinic), anatase (tetragonal) and rutile (tetragonal). Brookite is rare compared to anatase and rutile and, like these forms…

Language: English [EN]
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Brookite topic overview

The analysis highlights Measurement, Occurrence and associations and Overview as prominent areas in the source structure around Brookite.

Related topics
66
Source areas
7
Connected nodes
73
Extracted relationships
57
Concept neighborhoods
25
Bridge connections
73

What this topic covers Research coverage

Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.

Overview · 20 topics
Occurrence and associations · 17 topics
Appearance · 8 topics
Physical properties · 8 topics
Optical properties · 6 topics
Structure · 4 topics
Unit cell · 3 topics

Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

2V angle
Calculated: 12° to 20°
Birefringence
δ = 0.117
Category
Oxide minerals
Cleavage
Poor on {120}, in traces on {001}
Color
Deep red, reddish brown, yellowish brown, brown, or black
Crystal class
Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)

Explore all related topics Closing gaps

Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.

Overview

Unit cell

Structure

Appearance

Optical properties

Physical properties

Occurrence and associations

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

How Brookite connects Entity context

The extracted context around Brookite shows recurring relationship patterns in the source. For example, Brookite → Associated, Balochistan, Fron Olau, Gwynedd, In, Kharan, Pakistan, Prenteg, The, Twll Maen Grisial, Wales Another extracted example is Brookite → Mohs, The, This, Twinning. Use these groups to spot repeated connection types before inspecting the individual relationships.

Brookite

Top relations

related to Occurrence and associations · 11
Brookite → Associated, Balochistan, Fron Olau, Gwynedd, In, Kharan, Pakistan, Prenteg, The, Twll Maen Grisial, Wales
related to Physical properties · 4
Brookite → Mohs, The, This, Twinning
related to Appearance · 3
Brookite → Beautiful, It, They
related to External links · 3
Brookite → Archived, Crystal, Wayback MachineJMol
related to Optical properties · 3
Brookite → For, It, Refractive
related to Unit cell · 3
Brookite → Pcab, The, TiO2
related to Structure · 2
Brookite → Each, The
2V angle · 1
Brookite → Calculated: 12° to 20°
Birefringence · 1
Brookite → δ = 0.117
Category · 1
Brookite → Oxide minerals

Important terminology

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

rutile anatase also structure orthorhombic cell unit minerals tio2 forms crystal brown yellowish compared titanium reddish hardness refractive optical properties

Brookite relationships Subject–Predicate–Object triples

TTTA extracted 57 structured relationships around Brookite. Examples in this analysis include Brookite → 2V angle → Calculated: 12° to 20° and Brookite → Birefringence → δ = 0.117. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
Brookite2V angleCalculated: 12° to 20°1.00infobox
BrookiteBirefringenceδ = 0.1171.00infobox
BrookiteCategoryOxide minerals1.00infobox
BrookiteCleavagePoor on {120}, in traces on {001}1.00infobox
BrookiteColorDeep red, reddish brown, yellowish brown, brown, or black1.00infobox
BrookiteCrystal classDipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)1.00infobox
BrookiteCrystal habitTabular and striated, pyramidal or pseudohexagonal1.00infobox
BrookiteCrystal systemOrthorhombic1.00infobox
BrookiteDana classification4.4.5.11.00infobox
BrookiteDiaphaneityOpaque to translucent1.00infobox
BrookiteDispersion0.131 (compare to diamond at 0.044)1.00infobox
BrookiteFormulaTiO21.00infobox
BrookiteFormula mass79.88 g/mol1.00infobox
BrookiteFractureSubconchoidal to irregular1.00infobox
BrookiteLusterSubmetallic1.00infobox
BrookiteMohs scale hardness.mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .de…1.00infobox
BrookiteOptical propertiesBiaxial (+)1.00infobox
BrookitePleochroismVery weak, yellowish, reddish, orange to brown1.00infobox
BrookiteRefractive indexnα = 2.583 nβ = 2.584 nγ = 2.7001.00infobox
BrookiteSpace groupPbca1.00infobox
BrookiteSpecific gravity4.08 to 4.181.00infobox
BrookiteStreakWhite, greyish or yellowish1.00infobox
BrookiteStrunz classification4.DD.10 (10 ed) 4/D.15-10 (8 ed)1.00infobox
BrookiteTenacityBrittle1.00infobox
BrookiteTwinningOn {120}, uncertain1.00infobox
BrookiteUltraviolet fluorescenceNon-fluorescent1.00infobox
BrookiteUnit cella = 5.4558 Å, b = 9.1819 Å, c = 5.1429 Å; Z = 81.00infobox
Brookiteis aorthorhombic variant of titanium dioxide0.90text

Related concept clusters Concept neighborhoods

The concept neighborhoods around Brookite bring nearby vocabulary together. In this analysis, examples include Structure, Rutile and Minerals. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • Brookite
    • Structure
    • Rutile
    • Minerals
    • Crystal
    • Reddish
    • Brown
    • Orthorhombic
    • Tio2
    • Yellowish
    • Also
    • Anatase
    • Balochistan
  • brookite
    • Structure
    • Rutile
    • Minerals
    • Crystal
    • Reddish
    • Brown
    • Orthorhombic
    • Tio2
    • Yellowish
    • Also
    • Anatase
    • Balochistan
  • orthorhombic
    • Minerals
    • Structure
    • Tio2
    • Optical
    • Properties
    • References
    • Balochistan
    • Brittle
    • Cleavage
    • Formula
    • Fracture
    • Known
  • cell
    • Unit
    • Tio2
    • Formula
    • Per
    • Optical
    • Properties
    • References
    • Balochistan
    • Brittle
    • Cleavage
    • Compared
    • Fracture
  • crystal class
    • Brittle
    • Cleavage
    • Fracture
    • Minerals
    • Optical
    • Properties
    • References
    • Structure
    • Formula
    • Luster
    • Named
    • Pyramidal
  • brittle
    • Cleavage
    • Fracture
    • Crystal
    • Optical
    • Properties
    • References
    • Formula
    • Luster
    • Pyramidal
    • Striated
    • Twinning
    • Hardness
  • balochistan
    • Optical
    • Properties
    • References
    • Brittle
    • Cleavage
    • Formula
    • Found
    • Fracture
    • Luster
    • Pyramidal
    • Striated
    • Twinning
  • unit cell
    • Unit
    • Tio2
    • Formula
    • Per
    • Optical
    • Properties
    • References
    • Balochistan
    • Brittle
    • Cleavage
    • Compared
    • Fracture

Connections between topic areas Semantic bridges

For Brookite, one of the stronger structural bridges in this analysis connects Brookite with Overview. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.

Min side: 3
Brookite — Overview · splits 53 ⟂ 21
Brookite — Occurrence and associations · splits 56 ⟂ 18
Brookite — Appearance · splits 65 ⟂ 9
Brookite — Physical properties · splits 65 ⟂ 9
Brookite — Optical properties · splits 67 ⟂ 7
Brookite — Structure · splits 69 ⟂ 5
Brookite — Unit cell · splits 70 ⟂ 4

Map overview Semantic statistics

Brookite

Nodes74
Edges73
Triples57
Avg. degree1.97
Density0.027027
Components1

Source & methodology

TTTA analyzes the structure around Brookite to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as Measurement, Occurrence and associations & Overview, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — Brookite · EN edition · Analysis: TopicsToTalkAbout

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