BEAUTIFUL HEAVY CHUNK OF AMPHIBOLITE (SOLD AS BLACK GRANITE) METAMORPHIC ROCK WITH HORNBLEND (Black), ALBITE (White) AND LITTLE QUARTZ (Glister)

A NICE SAMPLE OF METAMORPHIC BLACK GRANITE ROCK. IT IS CALLED AMPHIBOLITE AND IS CHARACTERIZED BY THE DARK AREAS (CALLED HORNBLEND) AND THE WHITE AREAS (ALBITE A TYPE OF WHITE FELDSPAR) AND A FEW GLISTERING SHINY PIECES OF QUARTZ IMBEDDED.
IT PRIMARY CHARACTERISTIC VERY HEAVY HEAVIER THAN GRANITE CANNOT BE SEEN.
ITS IS A METAMORPHIC ROCK CHANGED ROCK.
IT IS A BEAUTIFUL ROCK SPECIMEN.

METAMORPHIC ROCK

METAMORPHIC ROCKS ARE FORMED UNDER THE SURFACE OF THE EARTH FROM THE METAMORPHOSIS (CHANGE) THAT OCCURS DUE TO INTENSE HEAT AND PRESSURE (SQUEEZING). THE ROCKS THAT RESULT FROM THESE PROCESSES OFTEN HAVE RIBBONLIKE LAYERS AND MAY HAVE SHINY CRYSTALS, FORMED BY MINERALS GROWING SLOWLY OVERTIME, ON THEIR SURFACE.

AMPHIBOLITE: AMPHIBOLITE IS A NON-FOLIATED (NOT PLATED OR SHEETLIKE) METAMORPHIC ROCK THAT FORMS THROUGH RECRYSTALLIZATION UNDER CONDITIONS OF HIGH VISCOSITY AND DIRECTED PRESSURE. IT IS COMPOSED PRIMARILY OF HORNBLENDE (CLASSROOM NAME USED FOR A GROUP OF DARK-COLORED AMPHIBOLE MINERALS)AND FELDSPAR MINERALS (IN OUR SAMPLE THE WHITE ALBITE), USUALLY WITH VERYLITTLE QUARTZ (YOU WILL SEE SMALL GLISTERING QUARTZ IMBEDDED).
 
Amphibolite has a variety of uses in the construction industry. It is harder than limestone and heavier than granite. These properties make it desirable for certain uses. Amphibolite is quarried and crushed for use as an aggregate in highway construction and as a ballast stone in railroad construction.
Higher quality stone is quarried, cut, and polished for architectural use. It is used as facing stone on the exterior of buildings, and used as floor tile and panels indoors. Some of the most attractive pieces are cut for use as countertops. In these architectural uses, amphibolite is one of the many types of stone sold as black granite.
 
SIZE: 114x14x6CM
CONDITION: IN GOOD CONDITION
ALSO SEE MY OTHER ITEMS LISTED. I HAVE TWO FOSSILS AND SOME OTHER INTERESTING ROCK SAMPLES ALSO ON AUCTION THIS WEEK.