159 
TERR^ ARGILLACE/S. opalus. 
37* OPALUS. Ex terra aluminari & plurima fllicea 
cum pauca ferri calce conflans , 
cui interdum pauxillum magnefis 
a\hz aut terrr^ calcaris accedit. 
Duriufculus , nitens ^ vix urtquam 
opacus, texturs conclioides , le- 
vis, in fragmenta indeterminata 
diffiliens, parafiticus, forms ut- 
plurimuni communis , facile ri- 
mas agens . 
Igne difficilime liquandus. 
•'Mro- 
T. 
'«Iti 
auge. 
Pici 
61 n. 
O. fabopacnis ia Uqaidh p?liucidu3 coloremque mutans, 
linguse adhaerens. 
Syfl.nat. Xli. 3.p. dg.n. 6. J'- Wall, miner. S}. fyft. 
min, I. p.2il}.n. ai; Achates unguium coioro ia aera 
opaca aqua pellucens. 
Briiekmann. von dem Wchaurc odcr Lapide mutabilli. 
Bnunsv. 1777. 
Liebenrotk ub. Nat. u. Menfch verni, mineral. Gcgenfi. ia 
Sachf. 2. Samml. iS. f. 49 ' 
Habitat in infularum Feroenfuim , Iflandite, Britanniae , 
Ilerruria; , Hangari* , Silefiat , Polonim , Sasonix, 
{yrix/ertim prope Hubertrhurg, ) Goe.ti .igix pir.eis, ni/~ 
lilibut , vulgaribus & vilioribas , ihaL edoniis , prafiis , 
chryloprajis , nephritico .^Jlrpiniino ^ granise jiifpide. , 
porphyrio argilla inJursia. albus, eburneus, ochroleucit.i, 
vitelUnus , rufefcens au'. vi’-ejceiis , rarius ,Ji unquam, 
pyramidis triaedra- forni : cnniparens, 
O. nitoris cerei , tcxturx huperFcffius concbacex. 
Habitat , rarius aut nunquam magr. im montium partem. 
conjihuer.s ,quam cliu fojjiiious , magnis Jir pe 
inr.iduLans in infulis lilandia . F.lha , in (rallia prope 
IVlefrill-Montant, etiam tn Alvernia. Eorez , Jdrit.annia 
iprope Pompetn,) Ha varia {prope Qizer.sdorf,) in. Tran- 
iilvania {prope Hettnanrfadt . Szcnt-frii.e 6’ ^(agyag, 9 
in Hiingatia , {propt Boiiiik , K(>tn'gsbefg , Scheraniz, 
Creihniz , 3 acobian , inter lasfi* Tokai , & inval~ 
ZeSitoka,) in mor.tiaus gigsiiteis in Saxonia {prope 
