CHARACTERISTICS | |
Weight | 1400 gr. 1.4 kg |
Size | max 11 cm 105x110x80 mm |
Reference | 211106463 |
Mineral | group of minerals Tourmaline |
Category | Decoration stones |
Group | Free forms |
Country | Madagascar |
Formula NaFe2+3 Al6 ((OH)4 (BO3)3 Si6O18)] TOURMALINE | |||
O | Oxygen | Other no metal | 40% |
Si | Silicon | Metalloids | 32% |
B | Boron | Metalloids | 10% |
Al | Aluminum | Poor metal | 7% |
Fe | Iron | Transition metal | 6% |
Na | Sodium | Alkali metal | 1% |
Mg | Magnesium | Alkaline earth metal | 1% |
Li | Lithium | Alkali metal | 1% |
K | Potassium | Alkali metal | 1% |
H | Hydrogen | Other no metal | 1% |
100% | |||
Tourmaline is a complex mineral, a member of the silicate group, more precisely cyclosilicates. It is characterized by a wide variety of colors, ranging from black to green, pink to red, blue to brown, and even colorless, which is due to its varied chemical composition and the presence of impurities. Tourmaline has a hardness of 7 to 7.5 on the Mohs scale, making it strong enough to be used in jewelry. It has uneven breakage, a vitreous luster, and a specific gravity between 2.82 and 3.32. A remarkable characteristic of tourmaline is its pyroelectricity: when heated, it acquires an electrical charge, which can attract dust particles.
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Shipping time
Your orders are usually shipped the day of the order and at the latest after 2 working days.
Delivery delay
Once the package is supported by the postal service, delivery times are those announced by the Post (letter followed or Colissimo followed). Parcel shipping from France.
Returns and Refund
Our refund and return policy lasts 14 days. You can read the details on the "return and delivery" page.