Engineering geology
magnesite-breccia

Magnesite Breccia

Magnesite ore cryptocrystalline and microcrystalline often is
cataclyzed and mylonited, which gives the result in magnesite
breccia. They are quite common variety. Fragments
cryptocrystalline and microcrystalline magnesite, centimeter or
millimeters dimension, are cemented by magnesite mass (crypt
and microcrystalline), less silica or silicon-magnesite binder.

All described above textural varieties refer to the pure ore. Very
often in the magnesite, come fragments of the surrounding
rocks, serpentinite that can occur as a side ingredients, or come
in significant amounts to 30%.
When the content pieces serpentine increases of 30-70% then
these are magnesite serpentinite breccias, and over 70% of are
serpentinite breccia and breccial serpentinite.

Magnesite – serpentinite breccia

When fragments of serpentinite represented over 30% to 70% then
separated as magnesite-serpentinite the breccia, having all the above
features, only significantly increased the content of serpentinite.
Magnesite comes as cement mass of 30-70%. Serpentinite is in the form
of pieces of very different sizes, color is green when it is complete
breccia green and white color, or serpentinite in varying degrees
carbonized and limonitized, then the breccia is yellowish-brown color.
Breccias are sometimes solid, sometimes softer, depending on the
granulometric composition, size and quantity of pieces of serpentinite.
(These magnesite-serpentinite breccias for now are treated as off-
balance sheet magnesite ore).

Serpentinite – magnesite breccias

Make the transition from previous rock to breccias and cracked
serpentinites. Usually along the peripheral parts of the above-described
breccias. Serpentine is a mesh sheet aggregate whose internetwork
areas almost completely filled with limonite, carbonate and with a little
talc. The cement mass is built from blurred cryptocrystalline and
microcrystalline magnesite with fragments of serpentinite psammite
dimensions. Cement compound is represented by 30% or usually much
less when fulfilling cracks and comes in the form of scum at cracks.

Magnesite vein begins and ends with the magnesite-serpentine breccias,
but also the apparent legality, is often disturbed, breccias are absent or
have been replaced with compact magnesite or sepiolite.

If pieces of serpentinite exceed 30% and range up to 70%, then this
lithotypes out as magnesite serpentinite breccias. It is, as already said,
the most expressed in peripheral parts of the veins, but comes in a vein
in the form lenses. Sometimes these breccias completely replaced
magnesite vein. These breccias, when thicker, and could be traced over
large areas, particularly were calculated and for now are treated as off-
balance sheet resources, which may be suitable separation methods can
concentrate.

The fault zones are encountered, with serpentinite, schistose serpentinite
and serpentinite breccias and mylonitized serpentinite. Breccias are
often tied with magnezite carbonate cement. Expressed are all mutual
passes from serpentinite, serpentinite over carbonytized to the
magnesite, quartz vein and sepiolite. Also the same refers appeared with
serpentine breccias, associated with little magnesite cement, the
magnesite up with fragments of serpentinite. Represented are all mutual
percentage refers.


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