kalsedoni , imperial green pyöreä

kalsedoni , imperial green pyöreä
kalsedoni , imperial green pyöreä
Tuotetta rajoitettu erä.
4,90 €
Sisältää alv. 24.00 %
Saatavuus Varastossa
Tuotenumero 390052

Kasedoni / chalcedony

 

Alkuperä (todennäköinen) : Burma

Paino ( ct noin ) : 0,35

Mitat ( mm noin ) : 4 x 4 x 2,8

Hionta : cobochon

Puhtaus : TL


               Erinomainen       Erittäin hyvä          Hyvä          ”kakkosluokkaa”

Hionta              X

Loisto              X

Väri                  X

Ominaista : väri käsitelty, läpikuultava,kirkkaan vihreä, "imperial green"

 

The name chalcedony is applied to any fine grained quartz with a fibrous or crypto- crystalline microstructure. It often displays some kind of distinctive banding. The name agate is used for the sub variety of chalcedony which displays distinctive banding with successive layers differing in color and degree of translucency.



Known Facts
Color Key:grayish, purple, white, green, blue, lavender, yellow, brown.
Refractive Index::1.530 - 1.539
Chemical Composition:SiO2
Hardness:6.5
Density:2.57 – 2.64
Crystal Group:Hexagonal
Ocurrence:Brazil, U.SA. Germany, India, Uruguay, Austarlia, Egypt, Italy, Scotland, South Africa, Namibia, Madagascar, Mexico, Tanzania, and many other localities throughout the world. 
The individual fibers of chalcedony and its subvarieties are not physically separable; they occur as parallel or near parallel aggregates or as spherules. The fiber direction is perpendicular to the layering while the banding is parallel to the free surface or cavity in which the chalcedony occurs. 

The hardness of chalcedony is variable around 6.5; somewhat lower than that of more coarsely crystallized quartz which has a hardness of 7. The specific gravity also varies according to porosity, water content, and the presence of other substances. The normal range is 2.57 – 2.64. Chalcedony is about 90 – 99% SiO2. Brown and reddish varieties are higher in Fe2O3.

Chalcedony fractures easily across the banding to give a splintery surface with a waxy luster. Most chalcedony is somewhat pale and grayish in appearance.

Chalcedony is deposited in a variety of environments and deposition is commonly at low temperatures. Light colored material is often found as a late hydrothermal deposit or an alteration product in acidic or basic igneous rocks, tuffs and breccias. It is very common as crusts of vein or cavity fillings.

The most prized of the chalcedonies are the translucent green stones known as chrysoprase and the brown iridescent and colorful stones known as fire agates. Other important kinds of chalcedony include bloodstone, lace agate, sard, iris agate, onyx, and carnelian.

hakusanoja:imperial green,vihreä,kalsedoni

UUTUUDET
Uusi
moonstone  / sinisellä sävyllä 3,5mm
7,90 €
Uusi
Imperial topaz ovaali 15ct bicolour
Imperial topaz ovaali 15ct bicolour
790,00 €
Uusi
Imperial topaz ovaali 13mm bicolour
Imperial topaz ovaali 13mm bicolour
690,00 €
Uusi
Imperial topaz sydän hionta 13ct
Imperial topaz sydän hionta 13ct
1 150,00 €
Uusi
Imperial topaz ovaali 16ct bicolour
Imperial topaz ovaali 16ct bicolour
750,00 €
Uusi
Imperial topaz ovaali 20ct
475,00 €
Uusi
Timantti ( 184 kpl ) valkokultainen sormus
Timantti ( 184 kpl ) valkokultainen sormus
950,00 €
Uusi
Ametriini Bolivia 19mm
Ametriini Bolivia 19mm
95,00 €
Uusi
citriinit 4mm
3,90 €
Uusi
TIMANTTI  3,8mm / 0.21ct / G / IF / GIA
695,00 €
Uusi
tulenoranssi Spessartiini Granaatti 5mm
26,50 €
Uusi
tulenoranssi Spessartiini Granaatti 5mm
24,50 €
Uusi
tulenoranssi Spessartiini Granaatti 3,4mm
14,50 €
Uusi
Omega geneve kultakello , kuin uusi
Omega geneve kultakello , kuin uusi
1 050,00 €
Uusi
TIMANTTI  4mm / 0.23ct / E / VS1/ GIA
685,00 €
Uusi
Suomalainen 14ct kultainen timanttikello, 1953
Suomalainen 14ct kultainen timanttikello, 1953