CALCITE CHALCOPYRITE QUARTZ
A lovely Calcite Chalcopyrite Quartz Crystal Specimen. This great piece showing good Chalcopyrite formation with Calcite and Quartz. Check out some of the interesting close up pics showing amazing crystals. There is also minor Sphalerite and what looks like Chlorite Quartz. A super nice piece and something different from the more commonly available Specimens. This Specimen makes a great gift or treat for someone special. This specimen looks way better than the pics show.
Borieva Mine, Madan, Bulgaria.
11cm x 8.2cm x 5.5cm, 470g.
Calcite name is from chalix the Greek word for lime. This is a most amazing yet, common mineral. Comprising about 4% by weight of the Earth’s crust and formed in many different geological environments. Calcite can form rocks of considerable mass and constitutes a significant part of all three major rock classification types. It forms oolitic, fossiliferous and massive limestones in sedimentary environments. Calcite serves as the cements for many sandstones and shales. Limestone becomes marble from the heat and pressure of metamorphic events.
A major ore of copper. Common in sulfide veins and disseminated in igneous rocks.
Weathering may lead to the formation of malachite, azurite, brochantite, langite and numerous other secondary copper minerals.
Chalcopyrite (or copper pyrite), looks like, and is easily confused with Pyrite, FeS2. Chalcopyrite is one of the minerals refered to as “Fool’s Gold” because of its bright golden colour. But real gold is a more buttery yellow and is ductile and malleable.
As an ore of copper, the yield of chalcopyrite is rather low in terms of atoms per molecule. It is only 25%, compared to other copper minerals such as chalcocite, Cu2S – 67%; cuprite, Cu2O – 67%; covellite, CuS – 50% or bornite Cu5FeS4 – 50%. However the large quantities and widespread distribution of chalcopyrite make it the leading source of copper. Chalcopyrite is a common mineral and is found in almost all sulfide deposits. Fine crystals of chalcopyrite have a unique character and can add to anyone’s collection.
Colour is brassy yellow, tarnishes to irredescent blues, greens, yellows and purples.
Luster is metallic.
Transparency: Crystals are opaque.
Crystal System is tetragonal; bar 4 2m
Crystal Habits are predominantly the disphenoid which is like two opposing wedges and resembles a tetrahedron. Crystals sometines twinned. Also commonly massive, and sometimes botryoidal.
Cleavage is rather poor in one direction.
Fracture is conchoidal and brittle.
Hardness is 3.5-4
Specific Gravity is approximately 4.2 (average for metallic minerals)
Streak is dark green.
Other Characteristics: Some striations on most crystal faces.
Associated Minerals are quartz, fluorite, barite, dolomite, calcite, pentlandite, pyrite and other sulfides.
Notable Occurances include Chile, Peru, Mexico, Europe, South Africa, several USA sites and many others around the world.
Best Field Indicators are crystal habit, tarnish, softness and brittleness.
Vibrates to number 9. Associations are to find lost objects, ancient cultures, energy blocks,mysticism, physical perfection, Chi, disorders of brain, RNA, DNA, lungs, infection, fevers, and inflammation.
Quartz, Silicon Dioxide:
One of the most common minerals found in the Earth’s crust. If pure, quartz forms colourless, transparent and very hard crystals with a glass-like luster. Quartz is a significant component of many igneous, metamorphic and sedimentary rocks. Silicon dioxide is found in a wide range of varieties and colours. Quartz in its polished form, was the most advanced technology thousands of years ago.