Identification and characteristics of silicate minerals

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Identification and characteristics of silicate minerals
Frame structure of silicate minerals and its identification characteristics as follows:

Frame structure of the silicate minerals and identifying characteristics

Frame structure of the silicate minerals
identifying characteristics
Plagioclase
A plate or a plate column, colorless, white or with other tones, a set of perfect cleavage, a group of secondary cleavage, two. 94 ° or 86 °, hardness of 6 ~ 6.5
Orthoclase

Short column or slabs, common Casbah twin or contact twin, meat is red, brown or pale yellow, two groups of perfect cleavage, angle 90 °

Nepheline
Fracture oil sheen, two groups of incomplete cleavage, easily weathered, meets HCl soluble into a gelatinous body
Zeolite group
Heulandite
Three to isometric shape or a plate shape, often into flake aggregates or secretion of body shape, cleavage parallel to the {010} completely
Analcite
Crystal often Chengsi angle surface of the body three eight or the cube with four angle surface of the body three eight poly shape, aggregates Duocheng granular, hardness of 5 ~ 5.5
Common carbonate mineral and identification features are as follows:
Common carbonate mineral and identification features

 

 

Common carbonate mineral
identification features
Calcite
Crystal Duocheng columnar, plate, rhomb and multiple three party scalenohedron, common polysynthetic twinning and contact twin, three groups of perfect cleavage, a hardness of 3, adding dilute hydrochloric acid rapid blistering cold
Magnesite
 
Dense granular aggregates, cleavage parallel to the {101} completely, powder in hot dilute hydrochloric acid gas foaming, releasing CO2.
Siderite
The crystal is the rhomb shape, short column or scalenohedron form, cleavage parallel to the {101} completely, in the cold HCl role of slow, after heating intensifies, cold HCl long time action turns yellow green
Smithsonite
A stalactite, crusty, kidney shaped and earthy aggregate, the relative density of 4 ~ 4.5, 4.5 ~ 5 hardness, powder cold dilute hydrochloric acid has a bubble
Cerusite
Crystal Duocheng columnar, plate column and false six dual cone, aggregate is compact massive, granular, stalactitic or earthy.Glass to adamantine luster, section is oily luster, cold hydrochloric acid foaming powder
Dolomite
Crystal face is curved saddle, cleavage parallel to the {101} completely, a hardness of 3.5 to 4
Malachite
Characteristics of the peacock green, forms are usually reniform, grape, inside with radiation fiber shape and concentric layered structure, plus cold dilute hydrochloric acid.
Azurite
Blue, often with Malachite copper oxides symbiosis.Cold dilute hydrochloric acid foaming.

 

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