IMA mineral species
Portlandite
Ca(OH)₂
Calcium hydroxide mineral.
Properties
⛏ Mohs hardness2
💅🪙🍶🔪💎
Scratches with a fingernail.
⚖ Density2.296 g/cm³
Light
🔷 Trigonal✏️ streak white
| Chemical formula | Ca(OH)₂ |
|---|---|
| Elements | Ca, O, H |
| Crystal system | Trigonal |
| Mohs hardness | 2 |
| Density | 2.296 g/cm³ |
| Streak | white |
| Color | — |
| IMA symbol | Por |
| Nickel–Strunz class | 4.FE.05 |
“—” means no reliable value in Wikidata yet. Check Mindat for full data.
Care & Handling
- 🪶 Soft, Scratches Easily Mohs 2: 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): Scawt Hill, United Kingdom
- 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.
Learn more
- Portlandite on Mindat.org
- Wikipedia article
- Wikidata item Q301805 (source of this page's data – you can correct it there)
IMA mineral species
2–3
Trigonal
GreenWhite & Clear
Soft, Scratches Easily