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ALUMINIUM CALCIUM SILICATE


EC / List no.: 215-476-7
CAS no.: 1327-39-5


Aluminum calcium silicate is an Occurs in nature as the minerals anorthite, didymolite, lawsonite, etc. 
Aluminum calcium silicate uses and applications include: Constituent of cement; in refractories, anticaking agent in table salt, vanilla powder, filler-reinforcement for plastics, phenolic, epoxy, melamine, nylon, polyimide, PBT, PVC, PC, DAP, polybutadiene, thermoset polyester, polyolefin, and urethane polymers; provides friction and wear properties in brake and clutch materials

Aluminum calcium silicate is a relatively hard, translucent, restorative material used primarily in anterior teeth.

Aluminum calcium silicate is an Occurs in nature as the minerals anorthite, didymolite, lawsonite, etc. Aluminum calcium silicate uses and applications include: Constituent of cement; in refractories; anticaking agent in table salt, vanilla powder; filler-reinforcement for plastics, phenolic, epoxy, melamine, nylon, polyimide, PBT, PVC, PC, DAP, polybutadiene, thermoset polyester, polyolefin, and urethane polymers; provides friction and wear properties

Partheite or parthéite is a Aluminium calcium silicate and a member of the zeolite group of minerals, a group of silicates with large open channels throughout the crystal structure, which allow passage of liquids and gasses through the mineral.
Aluminium calcium silicate was first discovered in 1979 in rodingitic dikes in an ophiolite zone of the Taurus Mountains in southwest Turkey.
The second discovery occurred in gabbro-pegmatites in the Ural Mountains, Russia.
Since its discovery and naming, the chemical formula for Aluminium calcium silicate has been revised from CaAl2Si2O8•2H2O to include not only water but hydroxyl groups as well.
The framework of the mineral is interrupted due to these hydroxyl groups attaching themselves to aluminum centered oxygen tetrahedra.
This type of interrupted framework is known in only one other zeolite, the mineral roggianite.
As a silicate based mineral with the properties of a zeolite, Aluminium calcium silicate was first described as zeolite-like in 1984 and listed as a zeolite in 1985.
Aluminium calcium silicate and lawsonite are polymorphs. 
Associated minerals include prehnite, thomsonite, augite, chlorite and tremolite.

Composition
Aluminium calcium silicate is a calcium alumino-silicate with the chemical formula Ca2Al4Si4O15(OH)2∙4(H2O).
This is a revised version of the formula reported initially as CaAl2Si2O8•2(H2O) that was determined using electron microprobe analysis.
A new formula was necessary after structural analysis revealed the presence of hydroxyl groups in the structure.
This new formula fell within the error limits of the initial electron microprobe analysis performed after the mineral was discovered in 1979.
Zeolites have alkali or alkai-earth ions bonded to the main alumino-silicate framework, as well as water molecules that take extra-framework spaces.
Aluminium calcium silicate is different from most zeolites in that it contains the extra hydroxide ions, but is still considered a zeolite by the Subcommittee on Zeolites of the International Mineralogical Association.

Structure
Aluminium calcium silicate’s crystal system is monoclinic with class 2/m and space group C2/c.
Aluminium calcium silicate is structured with oxygen surrounding both the aluminum and silicon atoms in tetrahedral formation. 
These oxygen and aluminum tetrahedra connect by their corners. 
Aluminium calcium silicate is a sorosilicate because two silicate tetrahedra connect at their corners and an aluminum tetrahedra is then attached to each end forming a zig-zag structure.
 Every second aluminum tetrahedron is attached to a hydroxide ion and the structure is interrupted. 
The oxygen tetrahedra connect in ladder-like chains to form large 10-membered rings as well as 8-membered, 6-membered, and two types of 4-membered rings. 
The calcium atoms and water molecules cross through the structure parallel to the c axis and sit in large channels created by the linked aluminum and silicon tetrahedral ringed structure, the main property of zeolites that allow for their absorption and dehydration abilities.

Physical Properties
Aluminium calcium silicate’s habit is fibrous and radial and is rarely found in distinct crystals.
Depending on where it is found, Aluminium calcium silicate can have transparent a white color or dark blue color but has a white streak regardless of which specimen is used. 
Aluminium calcium silicate has a vitreous luster and cleavage plains at {100} {110} {010} with a hardness of 4 on the Mohs scale.
Its space group is C2/c with a = 21.59(3), b = 8.78(1), c = 9.31(2) Å. β = 91.55(2) and Z = 4.
The mineral has not yet been found to twin.

Geologic Occurrence
Aluminium calcium silicate was first found in rodingitic veins along with prehnite, thomsonite, and augite in the Taurus Mountains in Doganbaba, Turkey in an ophiolite zone.
Aluminium calcium silicatehas also been found in gabbro-pegmatite in Denezhkin Kamen, Urals, in what is now the Russian Federation.
Aluminium calcium silicate’s crystallization is associated with the process of rodingitisation.
Rodingites refer to garnetized gabbros.

Chemical Properties    Aluminium calcium silicate is Irregular shaped grey colored rocks
Uses:
Constituent of cement; in refractories.
Aluminium calcium silicate is an anticaking agent used in vanilla powder. It is also used in salt up to 2%.

Constituent of cement; in refractories. Anti-caking agent. Used as building material

Production Methods
Aluminium calcium silicate is obtained by dissolving volcanic lava with hydrochloric acid, adding pure kaolin, calcium chloride and calcium hydroxide.

DESCRIPTION
Aluminium calcium silicates are crystalline metal aluminosilicates having a threedimensional interconnecting network of silica and alumina tetrahedra.

Appearance: White Powder
Brightness(ISO): 82+/-0.5%
Loss on ignition: 14%(Max)
Coarse particle on 53
Micron IS SIEVE (Max): 0.05%(Max)
Ph (of 20% aqueous solution): 4.5 to 6.5
Particles less than 2 micron: 68% w/w (Min)
Bulk density: 0.8%+-0.1 gm/cc
Moisture:    1%(Max)
Melting point: 1735 Deg.C
Specific gravity (H2O=1): 2.63


IUPAC NAMES:
aluminium(3+) ion calcium oxosilanebis(olate)
dialuminum;dicalcium;dioxido(oxo)silane
Silicic acid, aluminum calcium salt


SYNONYMS:
CALCIUM ALUMINOSILICATE
silicatecement
silicicacid,aluminumcalciumsalt
SODIUM ALUMINO-SILICATE
POTASSIUM ALUMINOSILICATE
MOLECULAR SIEVE TYPE AW-300
MOLECULAR SIEVE TYPE 5A
MOLECULAR SIEVE TYPE 4A
MOLECULAR SIEVE TYPE 3A
MOLECULAR SIEVES TYPE 5A
MOLECULAR SIEVES 5
MOLECULAR SIEVE, ACTIVATED, TYPE 5A
MOLECULAR SIEVE, ACTIVATED, INDICATING, TYPE 4A
MOLECULAR SIEVE, ACTIVATED, TYPE 4A
MOLECULAR SIEVE, ACTIVATED, TYPE 3A
MOLECULAR SIEVES
aluminium calcium silicate
Boiling stones, for analytical work
CALCIUMALUMINIUMSILICATE
SILICATE,CALCIUMALUMINIUM
ALUMINUM CALCIUM SILICATE
Molecular sieves, AW-300, 1/16in (1-2mm) diam. pellets
calciuM-aluMiniuM
MOLECULAR SIEVES USP/EP/BP


 

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