Crystopedia
IMA mineral species

Woodhouseite

🪶 Soft, Scratches Easily

CaAl₃(SO₄)(PO₄)(OH)₆

Alunite supergroup, phosphate-sulfate mineral.

PinkWhite & Clear

Woodhouseite specimen
Woodhouseite-113804.jpg · Wikimedia Commons (see file page for author & license)

Properties

⛏ Mohs hardness4.5
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💅🪙🍶🔪💎

A steel knife scratches it, it won't scratch glass.

🔷 Trigonal✏️ streak white
Chemical formulaCaAl₃(SO₄)(PO₄)(OH)₆
ElementsCa, Al, S, O, P, H
Crystal systemTrigonal
Mohs hardness4.5
Density—
Streakwhite
Color—
IMA symbolWdh
Nickel–Strunz class8.BL.05

“—” means no reliable value in Wikidata yet. Check Mindat for full data.

Care & Handling

  • 🪶 Soft, Scratches Easily Mohs 4.5: softer than a steel knife, so it scratches easily. Store it apart from harder stones.

🌍 Where it's found

Type locality (where it was first described): White Mountain Peak, United States

  • Type locality
  • Notable source / deposit
  • Country of origin

Marker positions are approximate (region or locality level). Type localities from Wikidata; notable sources curated by Crystopedia.

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