Locally, retrograde antigorite
after forsterite is common.
The principal minerals developed during serpentinisation are antigorite
MD simulations of water at the basal plane surfaces of kaolinite and antigorite
performed using DL_POLY_214 software (Smith and Forester, 1996) suggest that the silica tetrahedral face 001 should be hydrophobic, similar to pyrophyllite and talc, see Figure 9.
1999, The effects of dry grinding on antigorite
from Mulhacen, Spain.
This serves to reinforce our present understanding that our Horwood Lake antigorite
deposits are truly unique and not demonstrated anywhere else in the world.
There are two main families of asbestos: amphiboles (tremolite, actinolite, crocidolite) and serpentines (chrysorile, antigorite
The harzburgites consist of a groundmass of chrysotile, antigorite
, chlorite and Fe-oxides, in which, under the microscope, are still recognizable: olivine (chiefly by its habit outlined by Fe-oxides); some crystals, but generally only relicts, of enstatite; rare grains of plagioclase; and in places grains of chromite.
after talc (Larrabee 1969, and author's collection)
Preliminary assays and testing tabled by these prospectors confirm a serpentine deposit of an antigorite
concentration similar to Hedman's deposits at Horwood Lake and suggesting an attractive magnesium/iron ratio highly suitable for the Company's fiberization demands.
In particular, Hedman's unique antigorite
ore proved especially conducive to fiberization and evidenced demonstrable results in a series of test runs.
Native Elements Halides, Oxides & Hydroxides Awaruite Atacamite * Unnamed Bi-Ni-Fe-Pt alloy + Brucite * Unnamed Au-Cu alloy + Magnetite Theophrastite Sulfides Covellite * Arsenates, Sulfates Digenite * Annabergite + Heazlewoodite Retgersite * Millerite Unnamed nickel iron sulphate + Molybdenite * Pentlandite Polydymite * Carbonates Pyrite + Dypingite * Pyrrhotite * Gaspeite * Violarite + Hellyerite Magnesite + Otwayite + Pyroaurite * Reevesite * Zaratite Native Elements Silicates Awaruite Andradite Unnamed Bi-Ni-Fe-Pt alloy + Antigorite
Unnamed Au-Cu alloy + Chrysotile Clinochlore Sulfides Diopside * Covellite * Enstatite + Digneite * Glossular + Heazlewoodite Lizardite Millerite Opal Molybdenite * Palygorskite * Pentlandite Pecoraite * Polydymite * Stevensite (or Saponite?
Chrysotile and antigorite
are two other subcategories of serpentine.
A search through the recently computerized X-ray film archive (9-cm Debye-Scherrer camera) at the Mineralogical-Geological Museum in Oslo verifies that antigorite
, clinozoisite, hematite, hornblende, hydrozincite, lollingite, nontronite, orthochrysotile, portlandite, and stevensite have also been identified from mines and prospects in the Kongsberg area.
In Phase One, Hedman's antigorite
ore from its Horwood Lake, Ontario deposits was successfully fiberized adopting a series of monitored processes that resulted in a demonstrable fiber/shot yield.
In the antigorite
structure, a misfit between the octahedral and tetrahedral layers is resolved by structural adjustments that result in the formation of structural waves with different periodicities.