Avika Natural Black Tourmaline Rough Specimen

5.0

5 Ratings

1 Reviews

SKU: SMAS4821N

Color : Black

Dimension : 5x5x6 cm. Approx.

MRP : INR 1,500.00

SP : INR 350.00

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For International Buyers :
Through Express Delivery INR 4,500.00 Will be Charged. Delivery May Take 5-8 Working Days

Avika Natural Black Tourmaline Rough Specimen is natural unheated Tourmaline gemstone. It protects against electromagnetic smog such as cell phones, computers and televisions. Place the specimen near the appliance. It will defend you from psychic attack, spells and ill wishing. Black tourmaline is a base chakra stone and gounds you and increases physical vitality, releases tension and stress. Black tourmaline encourages you to have a positive attitude towards life, no matter what the circumstances. It clears negative thought patterns. Black tourmaline draws off negative energy. (Rest of the details will send you along with the product) Note: these are natural stones so there may be the difference in color and in drawing of the stone as per their occurrence in the nature. The stones have grains in them which are due to their crystal structure. These are natural stones so they are not completely finished some cracks and holes are there due to the variation of hardness in stones. You will get 100% similar product as per the availability in the stock.

DISCLAIMER: No claims are made on metaphysical properties of this stone. These literature is collected from writings, books, folklore and various sources. The actual product may slightly vary from picture as these are natural stone and no two stones can same in pattern.

Chemical Formula

The simple chemical formula, which covers the main forms of Tourmaline (Elbaite, Schorl, and Dravite), is as follows:
(Na,Ca)(Mg,Li,Al,Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

The expanded formula, which additionally covers Uvite, Liddicoatite, and Buergerite, is as follows:
(Na,Ca)(Mg,Li,Al,Fe²⁺,Fe³⁺)₃(Al,Mg)₆(BO₃)₃Si₆O₁₈(OH,O,F)₄

The formula for the Tourmaline group is very complex. See The chemical formula of Tourmaline for more details.

Composition

See The chemical formula of Tourmaline.

Color

Tourmaline is extremely varied in color. Colors include black, brown, green, red, pink, blue, and gray. White, colorless, yellow, orange, and purple colors are less common. Crystals are frequently multicolored, containing two or more distinct colors. Some specimens are pleochroic.

Streak

Whie

Hardness

7 - 7.5

Crystal System

Hexagonal

Crystal Forms
and Aggregates

Usually as elongated prismatic crystals that are heavily striated. Also as short, stubby, prismatic crystals. Most Tourmaline crystals have a rounded, triangular cross-section. Seldom in tabular crystals. Aggregates include columnar, radiating, botryoidal, stalactitic, in dense groups of tiny, elongated needles, and in compact masses.

Transparency

Transparent to opaque

Specific Gravity

2.9 - 3.3

Luster

Vitreous. Some black and brown specimens may be dull.

Cleavage

3,2

Fracture

Conchoidal to uneven

Tenacity

Brittle

Other ID Marks

1) Strongly pyroelectric.
2) Piezoelectric.
3) A few forms of Tourmaline fluoresce yellow in shortwave ultraviolet light.

In Group

Silicates; Cyclosilicates; Tourmaline Group

Striking Features

Color, crystal form, hardness, and deep vertical striations.

Environment

Elbaite, Schorl, and Liddicoatite are almost exclusively from granite pegmatites, while Dravite and Uviteor mostly from metamorphic environments such as marbles. Buergerite is from igneous rhyolite deposits.

Rock Type

Igneous, Metamorphic

Popularity (1-4)

Prevalence (1-3)

Demand (1-3)