Geology And Quicksilver Deposits of the New Almaden District Santa Clara County
Geology And Quicksilver Deposits of the New Almaden District Santa Clara County
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(See fig. 29. ) The plagioclase in all specimens examined is albite; it occurs mainly as intricately sutured interlocking crystals in irregular veinlets or as interstitial patches. The minerals of the epidote group generally form subhedral crystals which tend to be concentrated in layers. Garnet forms fractured porphyroblasts several millimeters in diam- eter, and in many specimens it is partly converted to FIGURE 29. Photomicrograph of hornblende-albite gneiss. Hornblende (H), albite (A), epid...ote (E), and blue-green sodic amphibole (sa). Note that sodic amphibole occurs in crystal continuity with horn- blende along path of albite veinlets.
40 GEOLOGY AND QUICKSILVER DEPOSITS, NEW ALMADEX DISTRICT, CALIFORNIA chlorite, as shown in figure 30. Chlorite also occurs in irregularly sheared veins and as abundant sharply bounded pseudomorphs. Probably after epidote. Sphene is very abundant, amounting to more than 4 percent of some specimens. Quartz occurs only in veins.
The relative proportions of the component minerals vary considerably, but hornblende is the most abun- dant.
What to read after Geology And Quicksilver Deposits of the New Almaden District Santa Clara County?
You can find similar books in the "Read Also" column, or choose other free books by Edgar Herbert Bailey to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
(See fig. 29. ) The plagioclase in all specimens examined is albite; it occurs mainly as intricately sutured interlocking crystals in irregular veinlets or as interstitial patches. The minerals of the epidote group generally form subhedral crystals which tend to be concentrated in layers. Garnet forms fractured porphyroblasts several millimeters in diam- eter, and in many specimens it is partly converted to FIGURE 29. Photomicrograph of hornblende-albite gneiss. Hornblende (H), albite (A), epid...ote (E), and blue-green sodic amphibole (sa). Note that sodic amphibole occurs in crystal continuity with horn- blende along path of albite veinlets.
40 GEOLOGY AND QUICKSILVER DEPOSITS, NEW ALMADEX DISTRICT, CALIFORNIA chlorite, as shown in figure 30. Chlorite also occurs in irregularly sheared veins and as abundant sharply bounded pseudomorphs. Probably after epidote. Sphene is very abundant, amounting to more than 4 percent of some specimens. Quartz occurs only in veins.
The relative proportions of the component minerals vary considerably, but hornblende is the most abun- dant.
What to read after Geology And Quicksilver Deposits of the New Almaden District Santa Clara County?
You can find similar books in the "Read Also" column, or choose other free books by Edgar Herbert Bailey to read onlineMoreLess
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