Substances & Homeopatic Remedies

    Aluminium silicata

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    aluminium silicate

    Etymology

    Source: Wikipedia:

     

    The earliest citation given in the Oxford English Dictionary for any word used as a name for this element is alumium, which British chemist and inventor Humphry Davy employed in 1808 for the metal he was trying to isolate electrolytically from the mineral alumina.

     

    Davy settled on aluminum by the time he published his 1812 book Chemical Philosophy: "This substance appears to contain a peculiar metal, but as yet Aluminum has not been obtained in a perfectly free state, though alloys of it with other metalline substances have been procured sufficiently distinct to indicate the probable nature of alumina."[52] But the same year, an anonymous contributor to the Quarterly Review, a British political-literary journal, in a review of Davy's book, objected to aluminum and proposed the name aluminium, "for so we shall take the liberty of writing the word, in preference to aluminum, which has a less classical sound."[53]

    Family

    Traditional name

    Andalusite Rock
         Syn.: Al2O(SiO4)
         German: Alumosilikat

    Used parts

    trit 1x of andalusite.

    Classification

    Minerals; Inorganic; Column Three

    Keywords

    metal
    silica-like
    alumina

    Original proving

    This valuable remedy is made from a species of rock known as andalusite and composed of aluminium sixty-three and Sil. thirty-seven parts. It was prepared by trituration in the usual way. (Kent)

    Description of the substance

    Andalusite is a polymorph with two other minerals; kyanite and sillimanite. A polymorph is a mineral that shares the same chemistry but a different crystal structure with another, or other, minerals. A unique variety of andalusite is called "chiastolite". It contains black or brown clay and/or carbonaceous material inclusioned in the crystal. These inclusions are arranged in regular symmetrical shapes. Usually they are in the form of a cross or X.

    PHYSICAL CHARACTERISTICS:
    Color is white, red, brown, orange and green.
    Luster is vitreous.
    Transparency crystals are transparent to translucent.
    Crystal System is Orthorhombic; 2/m2/m2/m
    Crystal Habits include prismatic crystals with a square cross section terminated by a pinacoid. also massive and granular.
    Cleavage is good in two directions.
    Fracture is splintery to subconchoidal.
    Hardness is 7.5
    Specific Gravity is approximately 3.15+ (above average)
    Streak is white.
    Associated Minerals are cordierite, biotite, feldspars, quartz, kyanite and sillimanite.
    Other Characteristics: dark inclusions produce cruciform shapes in the variety, chiastolite. Index of refraction is 1.632-1.638.
    Notable Occurrences include Andalusia, Spain; Austria; California, USA and China.
    Best Field Indicators are crystal habit, color, inclusions (if present) and hardness.


    Topaz is a common gemstone that has been used for centuries in jewelry. Its golden brown to yellow color is classic but is confused with the less valuable citrine, which is sold under the name topaz. The blue topaz that is often confused with aquamarine is rarely natural and is produced by irradiating and then heating clear crystals. Topaz is the November Birthstone.
    The structure of Topaz is controlled by a chain like structure of connected irregular octahedrons. These octahedrons have an aluminum in the middle surrounded by four oxygens. Above and below the aluminum are the hydroxide or fluoride ions. The chains of octahedrons are held together by individual silicate tetrahedrons but it is the octahedron chains that give topaz its crystalline shape. Topaz is the hardest silicate mineral and one of the hardest minerals in nature. However it has a perfect cleavage which is perpendicular to the chains and is caused by planes that break the weaker Al-O, Al-OH and Al-F bonds. None of the stronger Si-O bonds cross these planes. Topaz crystals can reach incredible size of several houndred pounds. Topaz can make very attractive mineral specimens due to their high luster, nice colors and well formed and multifaceted crystals.


    PHYSICAL CHARACTERISTICS:
    Color is clear, yellow, orange, red, blue and green.
    Luster is adamantine to vitreous.
    Transparency crystals are transparent to translucent.
    Crystal System is orthorhombic; 2/m 2/m 2/m
    Crystal Habits include a prismatic crystal with usually two different prisms that produce a rounded or sharp diamond-shaped cross-section. The termination is typically capped by a dome forming a roof like top. Another dome can modify the termination producing a point at the juncture of the two domes. A basal pinacoid can flatten the prisms termination or truncate the top of the domes. The pinacoid, multiple domes and occassionally orthorhombic pyramid faces can produce a complex, multifaceted and well formed termination. Topaz can be granular and massive.
    Cleavage is perfect in one direction, basal.
    Fracture is conchoidal.
    Hardness is 8.
    Specific Gravity is approximately 3.4 - 3.5+ (above average)
    Streak is white.
    Associated Minerals include quartz, tourmalines, micas, brookite, cassiterite and fluorite.
    Other Characteristics: index of refraction is 1.61 - 1.64. Prism faces maybe striated lengthwise.
    Notable Occurrences include Minas Gerias, Brazil; Pakistan; San Diego Co, California; Ural Mountains, Russia; Mexico and the Thomas Range, Utah.
    Best Field Indicators are crystal habit, color, density and hardness.