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Rough Lapis 1

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Original price $1,200
Current price $1,100

Top quality Mine 4 rough Lapis with bright and deep color. 

Weight: 5 kilograms

Price: 1100$ per kg

      Total Price for the whole 5kg lot: 5000$

Origin: Badakhshan, Afghanistan

Color: Blue

 

 

LAPIS:

This ancient rock is an aggregate of several minerals. The three major minerals that comprise lapis are lazurite, calcite, and pyrite. The rock can also contain lesser amounts of diopside, amphibole, feldspar, or mica. Lazurite is the ingredient responsible for producing the gem’s most prized color—bright royal blue. Lapis frequently contains varying amounts of whitish calcite matrix—the host rock that surrounds the gem—or flecks or veins of glinting yellow pyrite, or both. The gem can also have a smoothly uniform bodycolor, free of visible pyrite and calcite. Lapis is semitranslucent to opaque, with a waxy to vitreous luster. It has fair toughness, and its hardness ranges from 5 to 6 on the Mohs scale, depending on the mix of minerals. The lowest-quality lapis looks dull and green, the result of an excess of pyrite. Lapis with white calcite streaks is less valuable.

Worldwide, lapis is mined in several areas. The traditional source of the finest lapis lazuli is the same today as it was thousands of years ago—the mountains of Afghanistan. Other major sources are Chile and Lake Baikal in Siberia, Russia. Minor sources are Angola, Canada, Colorado (US), and Pakistan.

 

                                                                                              General

Category

Metamorphic rock

Formula

mixture of minerals with lazurite as the main constituent.

Crystal system

None, as lapis is a rock. Lazurite, the main constituent, frequently occurs as dodecahedra

Identification

Color

Blue, or purple, mottled with white calcite and brassy pyrite

Crystal habit

Compact, massive

Fracture

Uneven-Conchoidal

Mohs scale hardness

5–5.5

Luster

dull

Streak

light blue

Specific gravity

2.7–2.9

Refractive index

1.5

Other characteristics

The variations in composition cause a wide variation in the above values.