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PYRRHOTITE GALENA SPHALERITE QUARTZ

$115

PYRRHOTITE GALENA SPHALERITE QUARTZ
PYRRHOTITE GALENA SPHALERITE QUARTZ
PYRRHOTITE GALENA SPHALERITE QUARTZ
PYRRHOTITE GALENA SPHALERITE QUARTZ
PYRRHOTITE GALENA SPHALERITE QUARTZ
PYRRHOTITE GALENA SPHALERITE QUARTZ
PYRRHOTITE GALENA SPHALERITE QUARTZ
PYRRHOTITE GALENA SPHALERITE QUARTZ
PYRRHOTITE GALENA SPHALERITE QUARTZ

PYRRHOTITE GALENA SPHALERITE QUARTZ

$115

PYRRHOTITE GALENA SPHALERITE QUARTZ

An amazing combo of three great metals Pyrrhotite Galena Sphalerite Quartz! This location is known for its incredible metal/mineral specimens and this is no exception.  An affordable, collection-worthy piece.  This specimen is mounted on a perspex pad for enhanced display.

Location:
Dalnegorsk, Russian Federation.

Dimensions:
4.1cm x 7.9cm x 4.2cm, 140g.

Pyrrhotite: Fe7S8, Also given as Fe1-x (x = 0 to 0.17).

Sphalerite: ZnS.

PbS, Lead Sulfide.

Quartz: SiO2.

In stock

PYRRHOTITE GALENA SPHALERITE QUARTZPYRRHOTITE GALENA SPHALERITE QUARTZ

An amazing combo of three great metals Pyrrhotite Galena Sphalerite Quartz! This location is known for its incredible metal/mineral specimens and this is no exception.  An affordable, collection-worthy piece.  This specimen is mounted on a perspex pad for enhanced display.

Location:
Dalnegorsk, Russian Federation.

Dimensions:
4.1cm x 7.9cm x 4.2cm, 140g.

Pyrrhotite: Fe7S8, Also given as Fe1-x (x = 0 to 0.17).

Named in 1847 by Ours Pierre Armand Petit Dufrenoy from Greek “pyrrhos”, flame-coloured.  Pyrrhotite has some unusual characteristics.  First, it has an unusual formula.  The amount of sulfur does vary by roughly 20% or 50 to 55 atoms of sulfur per 50 atoms of iron.  Or is it the iron that varies?  Really the same difference.  Thus the unusual formula of Fe1-xS.  Secondly, it has two symmetries.  While this should indicate that there are two minerals and not one, in the case of pyrrhotite, mineralogists have made an exception.  When pyrrhotite is low in sulfur and the formula is closer to true FeS, then the structure is hexagonal.  But when it is high in sulfur, the structure is monoclinic.  Clearly two different symmetries, two different formulae; therefore, two different minerals except, in natural pyrrhotite crystals both phases are present in the same crystal.  If you are a purist, you can think of a pyrrhotite crystal as an assemblage of two minerals, but most minerologists treat it as one.

Thirdly, pyrrhotite is magnetic or at least weakly so.  It is the next most common magnetic mineral to magnetite.  Although not all specimens will show great evidence of magnetism if any, some will attract a paperclip or needle suspended from a string or move the needle of a compass.  Massive pyrrhotite is common and magnetism is sometimes the only way to distinguish it from other brassy colored sulfides such as chalcopyrite, pyrite, pentlandite or marcasite.  Good crystals are rare and should rightly be treasured as coming from a very unusual mineral.

Sphalerite: ZnS.

Sphalerite, also known as Blende or Zinc Blende, is the major ore of zinc. When pure (with little or no iron) it forms clear crystals with colours ranging from pale yellow (known as Cleiophane) to orange and red shades (known as Ruby Blende), but as iron content increases it forms dark, opaque metallic crystals (known as Marmatite).

PbS, Lead Sulfide.

Named by Pliny the Elder in 77-79 from the Greek “galene” meaning lead ore.

Galena is a common and popular mineral for rock hounds.  Its characteristic cubes, distinctive cleavage and high density make it easy to identify and a favorite in high school geology labs.  The structure of Galena is identical to that of halite, NaCl.  The two minerals have the same crystal shapes, symmetry and cleavage. Some Galena may contain up to 1% silver in place of lead.  The large volume of Galena that is processed for lead produces enough Silver as a by product to make Galena the leading ore of Silver.

Quartz: SiO2.

Quartz is the most common mineral found on the surface of the Earth.  A significant component of many igneous, metamorphic and sedimentary rocks, this natural form of silicon dioxide is found in an impressive range of varieties and colours.  There are many names for different varieties.

Additional information

Weight 160 g
Dimensions 5 × 8 × 5 cm

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