September 16, 2017

Agate 天然石-メノウ

English Name: Agate

German: Achat

Japanese:メノウ

French: Agate

Spanish: Ágata

Chemical Formula: SiO2 silicon dioxide (kind of Quartz)

Crystal system: Rhombohedral Microcrystalline

Hardness: 6.5–7

Luster: Waxy

Refractive index: 1.530–1.540 (Bi-refringence up to 0.004)...

March 14, 2017

In order to identify your gems or not, you have to understand the crystal structure.

What is Crystal Structure ?

In crystallography, crystal structure is a description of the ordered arrangement of atoms, ions or molecules in a crystalline material....

March 7, 2017

Gemstones or namely semi-precious stones are a product of the earth and formed by different ways:

1. like Diamond and Zircon, were formed deep in the earth over thousand or billion years and brought to the surface by explosions of molten rock.

2. like Topaz, Tourmaline...

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