3.1" Clear & Deeply Hoppered Fenster (skeletal) Quartz Crystal Mexico For Sale For Sale
Clear & Deeply Hoppered
FENSTER (SKELETAL) QUARTZ Crystal - Mexico
x 2.8" x 2.1"
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Small 2" Peg Stand
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this specimen, the quartz grew in a formation the Germans call fenster
quartz, which means window quartz, because the edges grew more quickly
than the faces, so the edges stand out like the frames of a window (another
term for this is skeletal quartz). Either way, the crystals grew very
quickly, developing a skeletal or hoppered framework, with the insides
hollow or only partly filled in.
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3.1" cabinet size
Rare skeletal quartz crystal
example of fenster growth
of our specimens come with a custom label with accurate locality information
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about crystals/mineral specimens from this location
an attractive SKELETAL (FENSTER) QUARTZ crystal from Arramberri,
Nueva Leon, Mexico. Skeletal quartz gets its name because when the crystal
was formed, there was not enough material to completely fill in the
matrix of the crystal, so open spaces were left inside the "skeleton"
formed by the edges of the crystal. Fenster means window in German,
and that's another term for this kind of growth. We found this fine
crystal on the stand of one of the large wholesale dealers set up at
the Tucson Gem, Rock & Mineral Show.
hoppered crystals, skeletal crystals have fully developed edges, but
the inner spaces are hollow. The result is a step lattice formation,
that looks like someone has taken out the insides of the crystals. Actually,
these empty areas never filled in, because the crystal grew very rapidly
and there either wasn't enough time or material to fill in the inside
of the crystal. The interior edges, which are formed in the ussual quartz
crystal form, look like a series of smaller and smaller steps going
down to the center. The casue of the skeletal formation is that electrical
attraction is stronger on the edges of the crystal, so they grow more
rapidly than the centers.
about gems, rocks and minerals
forming in the earth, quartz crystals sometimes grow so rapidly that
even on the point nearly all of the growth is on the edges and very
little is in the middle of the faces. The result is a sunken face habit
that crystal dealers call “hopper-growth”: there’s
actually a depression in the crystal faces. The sunken faces of quartz
crystals are occasionally sheeted over by a thin layer of quartz that
traps whatever water or mud might have been around at the time. This
type of crystal looks so much like a window the Europeans refer to it
as Fenster quartz, from das Fenster, the German word for window.
Quartz is the most common mineral on the face of the earth. It is found
in nearly every geological environment and is at least a component of
almost every rock type. It frequently is the primary mineral, >98%.
It is also the most varied in terms of varieties, colors and forms.
This variety comes about because of the abundance and widespread distribution
of quartz. A collector could easily have hundreds of quartz specimens
and not have two that are the same due to the many broad catagories.
The specimens could be separated by answers to the following questions:
color?, shade?, pyramidal?, prismatic?, druzy?, twinned?, sceptered?,
phantomed?, included?, tapered?, coated?, microcrystalline?, stalactitic?,
concretionary?, geoidal?, banded?, etc. Multiple combinations of these
could produce hundreds of unique possibilities.
Quartz is a fun mineral to collect. Its abundance on the Earth's surface
is incredible and produces some wonderful varieties that don't even
look like the same mineral. A collector must always be up on the many
varieties of quartz and it sometimes embarrasses a collector to have
collected too many specimens of such a common mineral. But nearly all
collectors concede that you can never really have enough quartz specimens.
Color is as variable as the spectrum, but clear quartz is by far the
most common color followed by white or cloudy (milky quartz). Purple
(Amethyst), pink (Rose Quartz), gray or brown to black (Smoky Quartz)
are also common. Cryptocrystalline varieties can be multicolored. Luster
is glassy to vitreous as crystals, while cryptocrystalline forms are
usually waxy to dull but can be vitreous. Crystals are transparent to
translucent, cryptocrystalline forms can be translucent or opaque. Crystal
system is trigonal; 3 2. Crystal habits are widely variable but the
most common habit is hexagonal prisms terminated with a six sided pyramid
(actually two rhombohedrons). Three of the six sides of the pyramid
may dominate causing the pyramid to be or look three sided. Left and
right handed crystals are possible and identifiable only if minor trigonal
pyramidal faces are present. Druse forms (crystal lined rock with just
the pyramids showing) are also common. Massive forms can be just about
any type but common forms include botryoidal, globular, stalactitic,
crusts of agate such as lining the interior of a geode and many many
more. Cleavage is very weak in three directions (rhombohedral). Fracture
is conchoidal. Hardness is 7, less in cryptocrystalline forms. Streak
is white. Specific Gravity is 2.65 or less if cryptocrystalline. (average).
Other Characteristics: Striations on prism faces run perpendicular to
C axis, piezoelectric (see tourmaline) and index of refraction is 1.55.
about crystal, gem and mineral metaphysics and healing
interested in metaphysics and crystal healing tell us that Skeletal
(Fenster) Quartz is a stone of spirituality and contentment. It helps
transmute lower energies into the higher frequencies of the spiritual
and ethereal levels. It represents the principles of complete metamorphosis.
It is said to balance the energies of the intellect, emotional, and
physical bodies. It clears the aura and bestows stability, strength,
finds a keeper!
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specimen comes with our label, giving the full mineral name plus accurate
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