Igeltsua mineralogian kaltzio sulfato bihidratatuari deitzen zaio, Ca(SO4) 2(H2O).
 Igeltsua | |
|---|---|
 | |
| Ezaugarri orokorrak | |
| Kategoria | Mineral |
| Formula | Ca(SO4) 2(H2O) |
| Nickel-Strunz sailkapena | 7.CD.40 |
| Sistema kristalino | Monoklinikoa 2/m |
| Masa molarra | 172,2 Da |
| Identifikazioa | |
| Kolorea | Gardena, zuria, grisa; hori-marroia ezpurutasunak direla eta. |
| Gogortasuna Mohs eskalan | 2 |
| Errefrakzio indizea | α=1.520, β=1.523, γ=1.530 |
| Marra | zuria |
| Dentsitate erlatiboa | 2,32 |
Eraikuntza eta eskulturagintzan mineral hori berotuz eta ehotuz lortzen den materialari ere "igeltsu" deitzen zaio, urarekin nahasten denean azkar gogortzen dena.
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