Pumice Stone is a volcanic rock that consists of highly
vesicular or perforated volcanic glass. Pumice Stone is created when
super-heated and highly pressurized rock has violently erupted from a volcano.
The unusual foamy configuration of pumice happens because of
simultaneous rapid cooling and rapid de-pressurization. Pumice Stone float on
water. Pumice Stone commonly originated from Turkey. Different
sizes of Pumice Stones are available, such as 2-5 cm which known as small Pumice
Stone. 3-5 cm which known as medium size Pumice Stone. And 5-7 cm which is known
as Large size Pumice Stone.
The hardness of Pumice Stone in Mohr scale is 6. The melting temperature of Pumice Stone is 15000˚ C and pH value is 8 and the density is 2.313g/cm3.
DESCRIPTION:
Amorphous (non-crystalline) in structure and composed primarily
of aluminium silicate, pumice is a naturally calcined volcanic glass foam
consisting of highly vesicular strands permeated with tiny air bubbles. It is
these frothy, friable glass vesicles that, when carefully refined to various
grades, give pumice its unique and infinitely useful qualities.
PHYSICAL PROPERTIES OF PUMICE STONE:
Description: Non-crystalline
(amorphous) foamed glass stone of volcanic origin. Grey-white (stone grades) to
white (powder grades) in appearance.
·
Brightness: (GE) 84
·
Hardness: (MOHS) 6
·
Reactivity: Inert (except in the presence of calcium
hydroxide or hydrofluoric acid)
·
pH: 7.2 (neutral)
·
Loose Bulk Density: Varies with grade (Download Technical
Data Sheet of specific product below)
·
Specific Gravity: 2.35
·
Softening Point: 900 Degrees C
·
Water-Soluble Substances: 0.15%
·
Radioactivity: None
CHEMICAL OF PROPERTIES OF PUMICE STONE:
·
Chemical Name: Amorphous Aluminum Silicate
·
Composition: Primarily made up of Silicon Dioxide and
Aluminum Oxide with traces of other oxides.
·
Silicon Dioxide: 76.2%
·
Aluminum Oxide: 13.5%
·
Ferric Oxide: 1.1%
·
Ferrous Oxide: 0.1%
·
Sodium Oxide: 1.6%
·
Potassium Oxide: 1.8%
·
Calcium Oxide: 0.8%
·
Titanium Oxide: 0.2%
·
Magnesium Oxide: 0.05%
·
Crystalline SiO2: none detected
