This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ... Zn2SiO4. These, or most all, are isomorphous, and in a crystal are capable of replacing each 1 The monoclinic calcium meta-silicate (CaSi03) or wollastonite is probably not found in slags. other indefinitely or within certain limits. Starting thus with pure Mg2SiO4, or perfect forsterite, and with pure Fe2SiO4 or ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ... Zn2SiO4. These, or most all, are isomorphous, and in a crystal are capable of replacing each 1 The monoclinic calcium meta-silicate (CaSi03) or wollastonite is probably not found in slags. other indefinitely or within certain limits. Starting thus with pure Mg2SiO4, or perfect forsterite, and with pure Fe2SiO4 or perfect fayalite, we have a system as shown in Fig 70.1 In this'series occur three definite mineral species, viz., forsterite, which may contain a certain amount of Fe2SiO4, then olivine which is always composed of Mg2SiO4 and Fe2SiO4 in varying amounts, and finally fayalite, chiefly or all Fe2SiO4, but which may contain certain amounts of Mg2SiO4. Further than this, small amounts of Mn2SiO4, CaSiC, or Zn2SiO4 may enter into the constitution and not change the mineral entity. When, however, these latter bases exceed certain amounts the mineral form is changed. There is a sub-group in this series--the monticellite group--in which Fig. 70.--The Forsterite-Fayalite series of minerals. the molecular ratio of CaO to other bases present is as 1:1, thus MgCaSiO4, a so-called double salt. In this group there is an artificial iron monticellite, CaFeSiO4. In true monticellite, viz., MgCaSiO4, small amounts of Fe. and other bases are usually present. An iron-lime olivine, viz., a mixed crystal, but not a double salt, in which the relation of CaO to FeO is indefinite, is also found. This explanation will give an idea of the nature of the silicate minerals in slags and brings out the fact that a given mineral species may vary rather widely in composition. As already stated, the mineral or minerals crystallizing out of a molten slag magma will depend on the chemical composition of the magma; if this corresponds closely to that of any in the given list of minera...
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