Amethyst is a three-dimensional network of tetrahedra where the silicon atoms are in the center and are surrounded by four oxygen atoms located at the vertices of a tetrahedron. This structure is quite rigid and results in quartz's hardness and resistance to weathering.

2023年4月23日 · Amethyst is a variety of the mineral quartz and has the same chemical formula as quartz, which is SiO2. This means that amethyst is composed of silicon and oxygen, with each silicon atom bonded to four oxygen atoms in a tetrahedral arrangement.

Amethyst often contains zones of polysynthetic Brazil law twinning, that is, it is composed of alternating layers of right- and left-handed twin domains, typically under the positive rhombohedral faces ("r faces" {1 0 -1 1}; Brewster 1823; McLaren and …

2025年1月19日 · Chemical Properties of Amethyst. Chemical Formula: Amethyst belongs to the quartz group of minerals. The chemical formula is SiO2 (silicon dioxide). This means that each Amethyst crystal consists of silicon atoms bonded to oxygen atoms.

2020年12月28日 · Amethyst is a type of quartz which is composed of silicon dioxide and is viewed in a transparent to sub translucent form. Amethyst is a semiprecious stone that is violet in color and occurs as prismatic crystals with pyramidal or bi-pyramidal endpoints.

Origin: Worldwide, notably Brazil, Uruguay, Bolivia. Mineral Species: Quartz. Mineral Group: Oxides. Chemical Formula: SiO 2. Hardness: 7. Crystal System: Trigonal. Colour: Pale lilac / violet to deep purple. Typical Appearance: Normally as druzy clusters, in typical amethyst form. More rarely as individual prismatic crystals. Commonly massive.

Amethyst is the purple variety of quartz, its chemical formula is SiO 2. In the 20th century, the color of amethyst was attributed to the presence of manganese. However, since it is capable of being greatly altered and even discharged by heat, the color was believed by some authorities to be from an organic source.

2024年2月1日 · Chemical Formula SiO2. Composition Silicon Dioxide. WHERE DOES THE NAME 'AMETHYST' COME FROM? Amethyst is believed to come from the Greek word 'Amethustos' - 'a' meaning 'not', and 'methustos' meaning 'to intoxicate'.

2024年9月29日 · The February birthstone mineral is amethyst, which is a purple or lavender variety of quartz. In nature, the crystal usually gets its purple color from iron impurities. However, irradiating quartz produces the purple color, too.

2016年3月8日 · Amethyst is a macro crystalline variety of Quartz with the chemical formula SiO2 (Silicon Dioxide). Mostly occurring as purple, lilac or mauve in colour, the purest form is colorless.