Bright outlook on gold futures

Precipitates caused by activity of organisms have greater significance and endlessly greater variability. These are often naturally combined with inorganic chemical precipitates and clastic sedimentary deposits.

Sulphur bacteria live in waters which are poorly aerated, or in those in which lack of oxygen and reducing conditions prevail abundantly present decaying organic substances. They can produce sulphur through their life processes, partly an elemental sulphur and partly as hydrogen sulphide. THE SULPHUR WAS ORIGINALLY DERIVED from the sulphides of eruptive rocks reaches the sea water in the form of sulphates or is present as primary sulphate of the sea water, and is thus brought into a form in which it can react with solutions of heavy metals; predominantly iron with subordinate zinc, lead, copper and other metals. There it can form sulphides again.

Its [pyrite's] tendency towards forming relatively large crystals, either idiomorphic or xenomorphic, often results in poikilitic development with inclusion of numerous other minerals ("Idioblastensieb"). This intergrowth, different from similar phenomena occurring in rocks, nevertheless must no[t] automatically be interpreted as resulting from a preceding deformation process. Reticulated or skeleton-shaped forms or growth can also result under conditions of very LOW temperature.