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Alunite: Measurement & Overview

Alunite is a hydroxylated aluminium potassium sulfate mineral, formula KAl3(SO4)2(OH)6. It was first observed in the 15th century at Tolfa, near Rome, where it was mined for the manufacture of alum. First called aluminilite by J.C. Delamétherie in 1797, this name was contracted by François Beudant three decades later to alunite.

Language: English [EN]
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Alunite topic overview

The analysis highlights Measurement and Overview as prominent areas in the source structure around Alunite.

Related topics
38
Source areas
1
Connected nodes
39
Extracted relationships
24
Concept neighborhoods
18
Bridge connections
39

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 · 38 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.

Birefringence
δ = 0.020
Category
Sulfate minerals
Cleavage
On {0001}, perfect
Color
Yellow, red, to reddish brown, colorless if pure; may be white, pale shades of gray
Crystal class
Hexagonal scalenohedral (3m) Space group: (3 2/m)
Crystal habit
fibrous to columnar, porcelaneous, commonly granular to dense massive

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

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 Alunite connects Entity context

The extracted context around Alunite shows recurring relationship patterns in the source. For example, Alunite → analog of jarosite, hydroxylated aluminium potassium sulfate mineral Another extracted example is Alunite → δ = 0.020. Use these groups to spot repeated connection types before inspecting the individual relationships.

Alunite

Top relations

is a · 2
Alunite → analog of jarosite, hydroxylated aluminium potassium sulfate mineral
Birefringence · 1
Alunite → δ = 0.020
Category · 1
Alunite → Sulfate minerals
Cleavage · 1
Alunite → On {0001}, perfect
Color · 1
Alunite → Yellow, red, to reddish brown, colorless if pure; may be white, pale shades of gray
Crystal class · 1
Alunite → Hexagonal scalenohedral (3m) Space group: (3 2/m)
Crystal habit · 1
Alunite → fibrous to columnar, porcelaneous, commonly granular to dense massive
Crystal system · 1
Alunite → Trigonal
Diaphaneity · 1
Alunite → Transparent to translucent
Formula · 1
Alunite → KAl3(SO4)2(OH)6

Important terminology

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

Important terminology

potassium found mined mineral aluminium near deposits alum also sulfate crystals white acid tolfa rhyolite hungary marysvale ore trigonal first

Alunite relationships Subject–Predicate–Object triples

TTTA extracted 24 structured relationships around Alunite. Examples in this analysis include Alunite → Birefringence → δ = 0.020 and Alunite → Category → Sulfate minerals. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
AluniteBirefringenceδ = 0.0201.00infobox
AluniteCategorySulfate minerals1.00infobox
AluniteCleavageOn {0001}, perfect1.00infobox
AluniteColorYellow, red, to reddish brown, colorless if pure; may be white, pale shades of gray1.00infobox
AluniteCrystal classHexagonal scalenohedral (3m) Space group: (3 2/m)1.00infobox
AluniteCrystal habitfibrous to columnar, porcelaneous, commonly granular to dense massive1.00infobox
AluniteCrystal systemTrigonal1.00infobox
AluniteDiaphaneityTransparent to translucent1.00infobox
AluniteFormulaKAl3(SO4)2(OH)61.00infobox
AluniteFractureConchoidal1.00infobox
AluniteIMA symbolAlu1.00infobox
AluniteLusterVitreous, somewhat pearly on {0001} for crystals, earthy if massive1.00infobox
AluniteMohs scale hardness3.5 – 41.00infobox
AluniteOptical propertiesUniaxial (+)1.00infobox
AluniteOther characteristicsStrongly pyroelectric Radioactive 9.44% (K)1.00infobox
AluniteRefractive indexnω = 1.572 nε = 1.5921.00infobox
AluniteSpace groupR3m1.00infobox
AluniteSpecific gravity2.6 – 2.91.00infobox
AluniteStreakWhite1.00infobox
AluniteStrunz classification7.BC.101.00infobox
AluniteTenacityBrittle1.00infobox
AluniteUnit cella = 6.98, c = 17.32 [Å]; Z = 31.00infobox
Aluniteis ahydroxylated aluminium potassium sulfate mineral0.90text
Aluniteis aanalog of jarosite0.90text

Related concept clusters Concept neighborhoods

The concept neighborhoods around Alunite bring nearby vocabulary together. In this analysis, examples include Potassium, Sulfate and Found. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • Alunite
    • Potassium
    • Sulfate
    • Found
    • Color
    • Formula
    • Jarosite
    • Kal3
    • Marysvale
    • Occurs
    • Oh
    • So4
    • Volcanic
  • alunite
    • Potassium
    • Sulfate
    • Found
    • Color
    • Formula
    • Jarosite
    • Kal3
    • Marysvale
    • Occurs
    • Oh
    • So4
    • Volcanic
  • alunite, utah
    • Potassium
    • Sulfate
    • Found
    • Color
    • Formula
    • Jarosite
    • Kal3
    • Marysvale
    • Occurs
    • Oh
    • So4
    • Volcanic
  • alum
    • Arizona
    • Color
    • Crystal
    • First
    • Formula
    • Hardness
    • Jarosite
    • Kal3
    • Oh
    • So4
    • Tolfa
    • Trigonal
  • sulfuric acid
    • Acid
    • Sulfuric
    • Rocks
    • Color
    • Crystal
    • Deposits
    • Formula
    • Hardness
    • Jarosite
    • Kal3
    • Oh
    • So4
  • potassium
    • Mineral
    • Called
    • Formula
    • Jars
    • Kal3
    • Marysvale
    • Masses
    • Mixture
    • Occurs
    • Oh
    • Ore
    • Rhyolite
  • potassium nitrate
    • Mineral
    • Called
    • Formula
    • Jars
    • Kal3
    • Marysvale
    • Masses
    • Mixture
    • Occurs
    • Oh
    • Ore
    • Rhyolite
  • sulfate mineral
    • Sulfate
    • Potassium
    • Hardness
    • Jarosite
    • Trigonal
    • Called
    • Formula
    • Kal3
    • Occurs
    • Oh
    • So4
    • White

Connections between topic areas Semantic bridges

Bridges highlight paths between different parts of the Alunite map and can reveal research angles that are easy to miss in a flat list.

Min side: 3

Map overview Semantic statistics

Alunite

Nodes40
Edges39
Triples24
Avg. degree1.95
Density0.05
Components1

Source & methodology

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

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

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