Zeolites: Phillips
Diagnostic Card.
K Ca Al 3 Si 5 O 16 * 6 H 2 O
Crystal system monoclinic
Hardness 4-4.5
Specific gravity 2.2
Cleavage is good
The break in the wrong
Colour colorless, differently colored
Color white powder
Gloss glass
It crystallizes as aggregates or characteristic spherulitic twin intergrowths of two or more individual crystals simulating orthorhombic, tetragonal, or sometimes cubic symmetry. It may be colorless, light gray or yellowish gray. White, gray, yellow, colorless.
Chemical composition. Potassium Oxide (K2O) 4.11% calcium oxide (CaO) 3-8%, alumina (Al2O3), 22 to 24%, silicon dioxide (SiO2) 44-48%, water (H2O) 15-17%, oxide sodium (Na2O) and 6%. Form crystals. Columnar crystals, complex twin growths. Class symmetry. Prismatic - 2 / t. Cleavage. Often manifested by little (001) and (010). Aggregates. Radiating, spherulitic, filling tonsils.
Diagnostic features.
The flame candle phillipsite first crack, then swells and finally melts, forming a light-gray glass. Under the action of hydrochloric acid dissolves, releasing jelly silica. Strong swells due to crystallization water loss. It dissolves readily in HCl.
Origin.
Typicus fillipsite - tonsil in basalts, where he sometimes exhibit together with the chabazite. It also occurs in other cavities of igneous rocks and some sedimentary rocks.
Place of Birth.
In Italy Phillips abundance comes in clumps leykotefrita on Monte Somma and leytsititovyh lavas in the Lazio province.
Phillips (transparent white) and gmelinite. A sample of 5 cm. Kurtz (= Ukrainka), Crimea. Photo: © VA Slёtov
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