Dolomite is a common
sedimentary rock-forming mineral that can be found in massive
beds several hundred feet thick.
Dolomite
differs from calcite, CaCO3,
in the addition of magnesium ions to make the formula,
CaMg(CO3)2.
The magnesium ions are not the same size as calcium and the two
ions seem incompatible in the same layer.
Dolomite can be
several different colors, but colorless and white are very
common. It is dolomite's pink color that sets another unique
characteristic for dolomite.
PHYSICAL
CHARACTERISTICS:
Color is
often pink or pinkish and can be colorless, white, yellow,
gray or even brown or black when iron is present in the
crystal.
Luster is
pearly to vitreous to dull.
Transparency
crystals are transparent to translucent.
Crystal System
is trigonal; bar 3
Crystal Habits
include saddle shaped rhombohedral twins and simple rhombs
some with slightly curved faces, also prismatic, massive,
granular and rock forming. Never found in scalenohedrons.
Cleavage is
perfect in three directions forming rhombohedrons.
Fracture is
conchoidal.
Hardness is
3.5-4
Specific
Gravity is 2.86 (average)
Streak is
white.
Other
Characteristics: Unlike calcite, effervesces weakly with
warm acid or when first powdered with cold HCl.
Associated Minerals: include
calcite,
sulfide ore minerals,
fluorite,
barite,
quartz and occasionally with
gold.
Notable
Occurrences include many localities throughout the world,
but well known from sites in Midwestern quarries of the USA;
Ontario, Canada; Switzerland; Pamplona, Spain and in Mexico.
Best Field
Indicators are typical pink color, crystal habit,
hardness, slow reaction to acid, density and luster.
SAVINA owns a
stone mine with reserve of more than 10,000,000m and currently
exporting Dolomite Stone and Dolomite Stone Powder with
dimention in accordance with Buyers requirement. Our Dolomite
contents that is made under XRF Spectrometry test are as
follows:
Ca :
21.40
SiO2
: 0.70%
Al2O3
: 0.50%
Fe2O3
: 0.15%
CaO : 29.90%
MgO : 22.20%
CaCO3
: 53.3%
The price can
be offered FOB Hai phong port or C&F according to Incoterms
2000. The shipping documents are :
