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Whewelliet is 'n kalsiumoksalaat wat as mineraal voorkom, byvoorbeeld in laetemperatuur-hidrotermale are.
| Whewelliet | |
|---|---|
 | |
| Formule | Ca(C2O4)∙H2O |
| Nickel-Strunz (10) | 10.AB.45 |
| Kleur | Kleurloos, wit, geel, bruin[1] |
| Glans | Perelagtig, glasagtig |
| Hardheid | 2,5 - 3 (Mohs) |
| Transparansie | Deursigtig, Deurskynend |
| Dubbelbreking | tweeassig (+) |
| RI-waardes | nα = 1.489 - 1.491 nβ = 1.553 - 1.554 nγ = 1.649 - 1.650 |
| Kristalsisteem | Monoklinies |
| Ruimtegroep | P2₁/c |
| Nommer | 14 |
| Eenheidsel | a = 6.290 Å, b = 14.583 Å, c = 10.116 Å
β = 109.46° |
| * Lys van minerale | |
Portaal  Geologie | |
Dit word nogtans soms ook biologies gevorm, soos in plante en in nierstene. en daar is talle organismes wat dit kan vervaardig.
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