Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . metimes a char-acter of importance. Frequently the grouping is irregular andapparently without law, as in Fig. 308 of Tyrolese epidote, but atother times there is an evident tendency to regular has already been described, pp. 65-71, in which the cor-responding crystal axes are usually inclined to each other. Atendency to parallel arrangement of corresponding axes is also fre-quently observed which may be shown either by isolated crystalswith their axes parallel, as in the case of
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . metimes a char-acter of importance. Frequently the grouping is irregular andapparently without law, as in Fig. 308 of Tyrolese epidote, but atother times there is an evident tendency to regular has already been described, pp. 65-71, in which the cor-responding crystal axes are usually inclined to each other. Atendency to parallel arrangement of corresponding axes is also fre-quently observed which may be shown either by isolated crystalswith their axes parallel, as in the case of the quartz crystals CHARACTERS OF MINERALS. 139 upon feldspar from Japan, shown in Or the crystals may be united inparallel or approximately parallel position,as in the pyromorphite, from Nassau, In certain instances the union of many crystals in approximately parallel position results in one larger crystal, either of the same form with slightly curved faces as in dolomite, Fig. 311, or of a different form, as in the formation of octahedral fluorite bythe union of Fig. 309.
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