SCHILLER-SPAR. The lustre of the principal fracture is splendent and metallic; that of the cross fracture dull, where splintery, pearly glimmering where fibrous. The principal fracture is foliated; the cross fracture splintery, sometimes passing into fibrous. It is opaque, but translucent in thin folia. The streak is greenish-grey, and dull. It is sectile. It is scratched by common hornblende. It is very slightly common flexible; It feels meagre. Gcognostic and Geograph to Situations. It occurs imbedded in serpentine in Fetlar and Unst in Zetland, and at Portsoy in Banffshire ; in the green stone rocks of Fifeshire; in the porphyritic rock of the Calton Hill *, and in similar rocks near Dunbarton ; ih serpentine between Ballantrae and Girvan in Ayrshire f. In Cornwall it occurs in serpentine and hornblende-slate. At Basta in the Ilartz, it is found in primitive green stone, which rests on granite, associated with com pact felspar, pinchbeck-brown mica, amianthus, (which appears passing into fibrous schillerstone), mountain- leather, precious serpentine, steatite, coppcr-pyrites, and iron-pyrites. Also disseminated in the serpentine of Zii- blitz, of Gastein in : Salzburg, and of the Pinzgau in the Tyrol. ' q 3' fi. Diallage. is divisible in the direction of all the planes, but most easily patallfcl to that of the termirial planes. These terminal pianos, and the cleavage, which is parallel with them, have u splendent metallic lustre, whilst the other plahes of the primitive form, and the cleavages, are dull, somewhat resembling the surface of steatite and serpentine, with which substances the Schillerstone seen in these directions has been frequently confounded. * Bournon. ■f Allan.
