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Tugtar spinéal ar bhall ar bith de ghrúpa mianraí ar ocsaídí dúbailte iad de mhiotail dhéfhiúsacha is thrífhiúsacha. Is iad na baill is tábhachtaí ná crómaít (FeCr2O4), an phríomhfhoinse cróimiam, maighnéidít (Fe3O4), agus spinéal (MgAl2O4) atá luachmhar mar sheoid, go príomha nuair a bhíonn dath dearg air de bharr mioneisíontas. Faightear iad mar mhianraí breise i gcarraigeacha doigheartha is meiteamorfacha.[1]
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Siombail cheimiceach | MgAl₂O₄ |
Eapainm | thorn (en) ![]() |
Aicmiú | |
Catagóir | Mianra |
Nickel-Strunz 10ú heag. | 4.BB.05 |
Nickel-Strunz 9ú heag. | 4.BB.05 |
Nickel-Strunz 8ú heag. | IV/B.01a |
Aicmiú Dana | 7.2.1.1 |
Airíonna | |
Criostalchóras | cubic crystal system (en) ![]() |
Spásghrúpa | space group Fd-3m (en) ![]() ![]() |
Cruas Mohs | 8 |
Dath an stríocáin | bán |
Stádas IMA | grandfathered mineral (G) (en) ![]() |
Siombail | Spl |
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