Banding in it is typically poorly developed. Hornblende gneiss member [of Collinsville Formation] - Dark, fine- to medium-grained, well-layered amphibolite and hornblende gneiss, composed of hornblende and plagioclase, commonly with biotite, garnet, or epidote, interlayered with light-gray felsic gneiss and pink quartz-spessartine rock (coticule). A Wulfenite Crystal Cluster! With old label with the name: Tyrolia-Lermittel. Something went wrong. Collection: John Betts - Fine Minerals: Description: Dark green Hornblende crystals in schist matrix with scattered Almandine Garnets. From shop CALEDONIANROCKSHOP. They look as if a large boulder was dropped from a distance, shattering the rock into the many pieces, still in place. Phosphate, biotite and chlorite from Portugal. // -->. Cataclasite (kat-a-CLAY-site) is a fine-grained breccia produced by grinding rocks into … Rosenbushite Eckermanite aegirine from Sweden. In Place. Thus, a schist containing biotite, garnet, quartz, and feldspar, would be called a biotite-garnet schist. The types of Schist are Mica Schists, Calc-Silicate Schists, Graphite Schists, Blueschists, Whiteschists, Greenschists, Hornblende Schist, Talc Schist, Chlorite Schist, Garnet Schist, Glaucophane schist. The largest Garnet measures 1.00' inch x.75' inch wide.This piece weighs over 1lb 5.0 ozs. Ex. The types of Slate are Not Available whereas types of Schist are Mica Schists, Calc-Silicate Schists, Graphite Schists, Blueschists, Whiteschists, Greenschists, Hornblende Schist, Talc Schist, Chlorite Schist, Garnet Schist, Glaucophane schist.. 5 out of 5 stars (270) 270 reviews $ 13.94. The Amphibolite classification is based on the followingstatements: 1) The modal compositions of amphibolites show that most ofthem contain more than 50% of amphibole, but those with 50 to 30% are notunusual. noun Petrography. en Gotthard highway tunnel) the Alpine metamorphic hornblende schists and … Hornblende gneiss and amphibolite - Dark-gray to mottled, fine- to medium-grained, massive to foliated amphibolite and gneiss, composed of hornblende and plagioclase, also commonly biotite and minor quartz; commonly interlayered with banded felsic gneiss. Hornblende is the most common member of a group of minerals known as amphibolites. // -->