Bulletin . ^ mTY^ (B) Photoinicrograph of a polished section of ore from the Durgy luine. Shows atypical graphic intergrowth of bornite and clialcocite. It will be noted thatthis section shows the irregular intergrowth, while that illustrated in (A)is largely of the lamellar type. They both show very marked similarity tothe eutectic structures so characteristic of alloys, mattes, and slags, and thewriter believes they represent contemporaneous deposition of the two sul-phides. Liffht ^^ clialcocite. Dark = bornite. VIRGINIA GEOLOGICAL StlliVEY. PLATE ?5^r>^y^ (B) Photomicroiirapli of
Bulletin . ^ mTY^ (B) Photoinicrograph of a polished section of ore from the Durgy luine. Shows atypical graphic intergrowth of bornite and clialcocite. It will be noted thatthis section shows the irregular intergrowth, while that illustrated in (A)is largely of the lamellar type. They both show very marked similarity tothe eutectic structures so characteristic of alloys, mattes, and slags, and thewriter believes they represent contemporaneous deposition of the two sul-phides. Liffht ^^ clialcocite. Dark = bornite. VIRGINIA GEOLOGICAL StlliVEY. PLATE ?5^r>^y^ (B) Photomicroiirapli of a imlidio,) -^ <^- Shows a U-pilal Su^lStte-c:;^^^ ^f ^1 T * ^^^^ ^-^1-°* ^o- finelainellaM,S-mvth . ^^.^^/^ ^^ «»te similar to thegrowths are etclied it is c ea^lf si o VtL7- ^^^ ^^^^- ^^ ^^^ ^^l i*-are intergrown along e^,-sSnogi\M; dh-eeo;;* ^^^ * *° -^^^Wliitc = chaleocite. Dark = l.„i„ite. VIRGINIA GEOLOGICAL SURVEY. PLATE XVI.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectgeology, booksubjectm
