在线聊天
1.Advantage:
- assure the high quality of products.
- .All products will be supplied according to customers different requirements.
- one-stop service
- A grade products with high purity
- production capacity:1000-1500 metric ton/month
2,Tourmaline Sizes:
Tourmaline rough: 1cm below, 1-2cm, 2-5cm, 5cm above
Tourmaline particle: 1-4mm, 3-5mm, 5-8mm, 10-30mesh, 30-60mesh
Tourmaline powder: 80mesh, 100mesh, 200mesh, 325mesh, 500mesh, 800mesh, 1200mesh, 1500mesh, 2000mesh, 3000mesh, 4000mesh, 8000mesh
Tourmaline ceramsite: 1-2mm, 2-5mm, 5-8mm, 15mm, 18-20mm, 25mm
3.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 |
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 red |
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 |
5.Package:
1).if no special request, we will use normal packing,25kg PVC bag, then 40 bags in a big bag for 1000 Kilograms.
2).if need special packing or marks, please list them in your E-mail. We would like to make the packing as requested
6.Payment:
1).Our first choice is T/T. For a large order 40% T/T in advance is earnest money, the rest to be paid in 7-10 days after getting B/L copy. For a small order,100% T/T in advance.
2).Second choice is L/C. We can accept irrevocable L/C at sight. For a large order 40%T/T, 60%L/C. We couldn’t accept L/C for a small order. The best way of payment we advise is T/T, because L/C is very complicated and a lot of extra fee is to give the bank
3).The others: West Union, Paypal.
7.Factory Visit:
1).Welcome any customer to visit our factory directly
2).If customer have any scheduling in China, please let us know. We would like to help you book the hotel and pick up you from airport or railway station
