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Opal and Tourmaline(October Birthstones)

OPAL and tourmaline (OCTOBER BIRTHSTONE)

Those born in October enjoy two spectacular birthstones to commemorate their birthdays-opal and tourmaline. Both October birthstones have endless color combinations and beautiful coloring characteristics.
 

# Opal:
Opal is a birthstone for October, also the gem of the 14th anniversaryOpal is the world's most popular phenomenal gem. Many cultures have credited opal with supernatural origins and powers. Arabic legends say it falls from the heavens in flashes of lightning. The ancient Greeks believed opals gave their owners the gift of prophecy and guarded them against disease. Europeans have long considered the gem a symbol of hope, purity, and truth.
Opal contains up to 20% water trapped in its silica structure. Experts divide opals into many different categories, Four of the main types are:

White Opal: Play of color against a white or light gray body-color

Black Opal: Play of color against a black or other dark bodycolor

Fire Opal: Doesn't show a play of color, yellow, orange, Or red body color, known as Mexican opal, Gold opal, Or Sun opal

Boulder Opal: Play of color against light to a dark background. host rock fragment or metrix are part of the finished gems

FACTS:-

Mineral: Hydrated Silica

Chemistry: SiO2•nH2O
Color: All colors
Refractive index: 1.37-1.47
Birefringence: None
Specific gravity: 2.15 ( 0.08, -0.90)
Mohs Hardness: 5 to 6.5 on the Mohs scale

Sources / Origin:
Black & White opal: Australia and Ethiopia
white opal: Brazil
Fire opal: Mexico and Brazil
       Treatment: Suger & Smoke, Impregnation & Assemble.

     
 Care and cleaning: Warm soapy water is always safe. Ultrasonic and steam cleaning are not recommended. 
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