ShengPing Brand High quality Tourmaline - TradeSNS

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 Green Tourmaline: Strong; dark green, yellow-green Brown Tourmaline: Definite; dark brown, light brown Blue 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

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