Tumbled Smoky Quartz Crystal Stone 1.0 to 9.2 g small size pieces 200 gram Lot

Description

Well tumbled Natural Smoky Quartz Crystal Stone (small size pieces) - 0.2 Kg Lot (0.44 pound)
Weight per piece: 1.0 to 9.2 gram
Sizes:  5x10x13 mm to 12x18x22 mm (0.2x0.4x0.5 to 0.5x0.7x0.9 inch)
Quantity: about 32 to 82 pieces in each lot
These stones are from Brazil.
The pictures in the listing is just for reference as we are selling multiple pieces with same pictures.
***
Smoky Quartz
Selltotheworld
From all around the world
Tumbled Smoky Quartz Crystal Stone 1.0 to 9.2 g small size pieces 200 gram Lot
Well tumbled Natural
Smoky Quartz Crystal Stone
(small size pieces) -
0.2 Kg Lot (0.44 pound)
Weight per piece: 1.0 to 9.2 gram
Sizes:  5x10x13 mm to 12x18x22 mm (0.2x0.4x0.5 to 0.5x0.7x0.9 inch)
Quantity: about 32 to 82 pieces in each lot
These stones are from
Brazil
.
The pictures in the listing is just for reference as we are selling multiple pieces with same pictures.
***
Smoky Quartz
Smoky
or
smokey quartz
is a brown to black variety of quartz.[1] Like other quartz gems, it is a silicon dioxide crystal. The smoky colour results from free silicon, formed from the silicon dioxide by natural irradiation.
A very dark brown to black opaque variety is known as morion.
The
color
of smoky quartz is caused by irradiation and traces of aluminum built into its crystal lattice. Aluminum replaces silicon to form a [AlO4]- group instead of [SiO4]. To compensate for the imbalance of charge in the lattice, small monovalent cations (H+, Li+ or Na+) are built into the lattice, as well. High energy radiation transfers the extra electron from [AlO4]- to the cation, and a
color center
is formed. Interestingly, H+ seems to interfere with this process, and higher concentrations of built-in hydrogen inhibit the formation of color-centers. In normal geological environments this process can only take place at temperatures below 50°C, otherwise the rate of color center destruction surpasses that of color center formation. So the color of the crystals appeared long
after
the crystals have grown. It is estimated that it takes several million years for a crystal to assume a deep color in a granite of average composition.
The color of smoky quartz is typically much more homogeneous than that of amethyst, but often still more intense at the tips of the crystals. Crystals that show a zonar or patchy coloration are not uncommon, however, and often these are most intensely colored at the edges between the rhombohedral faces. Sometimes a dark color is caused by impurities like organic compounds or manganese oxide, but those rocks should not be called "smoky quartz". That name is reserved for quartz whose color has been induced by radiation.
True smoky quartz will loose its color when heated to about 200°C, and the color will occur again when the crystal is irradiated with x- or gamma-rays. Some (but reportedly not all) smoky quartz is sensitive to ultraviolet light and will pale when exposed to sunlight for a long time. It is not as sensitive as amethyst, though.
Smoky quartz basically appears in the same
crystal habits
(e.g. long- or short-prismatic, platy, as scepters, with trigonal habit, or as skeleton quartz), and
crystal forms
(determined by the type of crystal faces that appear on a crystal) as rock crystal. Skeleton quartz and needle quartz seem to be an exception, they both are fast-growing forms and the latter in particular for some reason in most cases doesn't darken upon irradiation. A growth form that is very often smoky is the
gwindel
, because these apparently only grow in igneous and highly metamorphosed rocks, and usually grow very slowly.
Smoky quartz is usually found in intrusive igneous and certain high grade metamorphic rocks, like granite and orthogneiss, as these contain traces of radioactive elements whose radiation cause the coloration.
Natural smoky quartz comes from many sources around the world. A few of the more noteworthy locations include Brazil, the world's largest supplier.
Item Specifics
Total Carat Weight (TCW) :
1100
Natural/Lab-Created :
Natural
Color :
Smoky
Shape :
Rough
Treatment :
Not Enhanced
Brand :
Unbranded
Country/Region of Manufacture :
China
Country of Manufacture :
China
Carat Range :
Greater than 6.00
Modified Item :
No
Country of Origin :
Brazil
Payment
By Paypal
Shipping
Free shipping cost.
We send the goods to USA, Canada, UK, Australia, New Zealand, EU countries and some other European and Asian countries by E-express, a kind of fast postal service by Hong Kong Post. It usually takes about 6 to 10 working days for delivery.
We send the goods to other countries by registered airmail and will take about 8 to 14 working days for delivery.
Returns
Returns: We accept returns with any reason in 30 days.
Contact Us
We will answer buyer messages within 24 hours during working days.
Selltotheworld
From all around the world
DESCRIPTION
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SHIPPING
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CONTACT US
Tumbled Smoky Quartz Crystal Stone 1.0 to 9.2 g small size pieces 200 gram Lot
Well tumbled Natural
Smoky Quartz Crystal Stone
(small size pieces) -
0.2 Kg Lot (0.44 pound)
Weight per piece: 1.0 to 9.2 gram
Sizes:  5x10x13 mm to 12x18x22 mm (0.2x0.4x0.5 to 0.5x0.7x0.9 inch)
Quantity: about 32 to 82 pieces in each lot
These stones are from
Brazil
.
The pictures in the listing is just for reference as we are selling multiple pieces with same pictures.
***
Smoky Quartz
Smoky
or
smokey quartz
is a brown to black variety of quartz.[1] Like other quartz gems, it is a silicon dioxide crystal. The smoky colour results from free silicon, formed from the silicon dioxide by natural irradiation.
A very dark brown to black opaque variety is known as morion.
The
color
of smoky quartz is caused by irradiation and traces of aluminum built into its crystal lattice. Aluminum replaces silicon to form a [AlO4]- group instead of [SiO4]. To compensate for the imbalance of charge in the lattice, small monovalent cations (H+, Li+ or Na+) are built into the lattice, as well. High energy radiation transfers the extra electron from [AlO4]- to the cation, and a
color center
is formed. Interestingly, H+ seems to interfere with this process, and higher concentrations of built-in hydrogen inhibit the formation of color-centers. In normal geological environments this process can only take place at temperatures below 50°C, otherwise the rate of color center destruction surpasses that of color center formation. So the color of the crystals appeared long
after
the crystals have grown. It is estimated that it takes several million years for a crystal to assume a deep color in a granite of average composition.
The color of smoky quartz is typically much more homogeneous than that of amethyst, but often still more intense at the tips of the crystals. Crystals that show a zonar or patchy coloration are not uncommon, however, and often these are most intensely colored at the edges between the rhombohedral faces. Sometimes a dark color is caused by impurities like organic compounds or manganese oxide, but those rocks should not be called "smoky quartz". That name is reserved for quartz whose color has been induced by radiation.
True smoky quartz will loose its color when heated to about 200°C, and the color will occur again when the crystal is irradiated with x- or gamma-rays. Some (but reportedly not all) smoky quartz is sensitive to ultraviolet light and will pale when exposed to sunlight for a long time. It is not as sensitive as amethyst, though.
Smoky quartz basically appears in the same
crystal habits
(e.g. long- or short-prismatic, platy, as scepters, with trigonal habit, or as skeleton quartz), and
crystal forms
(determined by the type of crystal faces that appear on a crystal) as rock crystal. Skeleton quartz and needle quartz seem to be an exception, they both are fast-growing forms and the latter in particular for some reason in most cases doesn't darken upon irradiation. A growth form that is very often smoky is the
gwindel
, because these apparently only grow in igneous and highly metamorphosed rocks, and usually grow very slowly.
Smoky quartz is usually found in intrusive igneous and certain high grade metamorphic rocks, like granite and orthogneiss, as these contain traces of radioactive elements whose radiation cause the coloration.
Natural smoky quartz comes from many sources around the world. A few of the more noteworthy locations include Brazil, the world's largest supplier.
Item Specifics
Total Carat Weight (TCW) :
1100
Natural/Lab-Created :
Natural
Color :
Smoky
Shape :
Rough
Treatment :
Not Enhanced
Brand :
Unbranded
Country/Region of Manufacture :
China
Country of Manufacture :
China
Carat Range :
Greater than 6.00
Modified Item :
No
Country of Origin :
Brazil
Payment
By Paypal
Shipping
Free shipping cost.
We send the goods to USA, Canada, UK, Australia, New Zealand, EU countries and some other European and Asian countries by E-express, a kind of fast postal service by Hong Kong Post. It usually takes about 6 to 10 working days for delivery.
We send the goods to other countries by registered airmail and will take about 8 to 14 working days for delivery.
Returns
Returns: We accept returns with any reason in 30 days.
Contact Us
We will answer buyer messages within 24 hours during working days.
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