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natrual black tourmaline crystals with high quality and low price
Place of Origin: Hebei, China
Brand name: Jiaxin
Application: radio industry, jewelry, filter, health care, etc
Category: cyclosilicate
Size: 10-20mesh 20-40mesh 200mesh 325mesh
Color: Most commonly black, but can range from brown, violet, green, pink, or in a dual-colored pink and green
Quality: Natural
Identification: ISO9001:2000
MOQ: 15MT
Packaging: 25-50KG/bag, or 1MT/bag, and packing can be customized
Port: XINGANG, CHINA (Tianjin)
Delivery time: 15days after confirmation of order
Payment: T/T L/C
Supply ability: 500T/MTS per month more
Applications:
1. High pure tourmaline is the bijou that can be made into jewelry such as necklace bracelet and so on. |
2. It can be used in deodorizing wall paper, floorboard, ceiling board furniture inner wall coasting material and concrete. |
3. Packing material with the function of antibacterial and fresh keeping. |
4. The healthy filling of cigarette filter tip. |
5. Purification materials for water and air. |
6. Additive of toothpaste and cosmetic |
7. Antibacterial coating and is use in electronic equipment and house hold electric. |
8. Made composite ceramic with the function of antibacterial sterilization and deodorization. |
Typical chemical analysis:
element | Percent by weight (%) |
SiO2 | 37.05 |
Al2O3 | 29.8 |
MgO | 8.05 |
CaO | 1.18 |
K2O | 0.09 |
FeO | 8.33 |
NaO2 | 1.19 |
Cr2O3 | 0.22 |
B2O3 | 10.16 |
TiO2 | 0.44 |
Typical chemical formula:
(Ca,K,Na,[])(Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,V)6(BO3)3(Si,Al,B)6O18(OH,F)4
Typical physical properties:
Density | 2.82-3.32 |
Hardness | 7-7.5 |
Crystal habit | Parallel and elongated. Acicular prisms, sometimes radiating. Massive. Scattered grains (in granite) |
Crystal system | Trigonal |
Cleavage | Indistinct |
Fracture | Uneven, small conchoidal, brittle |
Luster | Vitreous, sometimes resinous |
Streak | White |
Specific gravity | 3.06 (+.20 -.06) |
Polish luster | Vitreous |
Optical properties | Double refractive, uniaxial negative |
Refractive index | nω=1.635–1.675, nε=1.610–1.650 |
Birefringence | -0.018 to -0.040; typically about .020 but in dark stones it may reach .040 |
Pleochroism | typically moderate to strong Red Tourmaline: Definite; dark red,light redGreen Tourmaline: Strong; dark green, yellow-greenBrown Tourmaline: Definite; dark brown, light brownBlue Tourmaline: Strong; dark blue, light blue |
Dispersion | .017 |
Ultraviolet | pink stones—inert to very weak |
Fluorescence | red to violet in long and short wave |
Absorption spectra | a strong narrow band at 498 nm, and almost complete absorption of red down to 640nm in blue and green stones; red and pink stones show lines at 458 and 451nm as well as a broad band in the green spectrum |
Samples are available.
Products are to be produced as per samples confirmed. Quality checking is done in the factory by our QC team and clients/or a third party named by clients.
Price is negotiable based on specification, quantity, delivering time etc…
tourmaline