TABLE I 

 Granular Siliceous Rocks 



Name and Place . 



Texture. 



Granularity . . . 



Quartz 



Orthoclase 



Micropegmatite . 

 Microperthitic 

 intergrowth . . 



Microcline 



Oligoclase 



Muscovite 



Biotite 



Hornblende. 



Augite 



Titanite .... 



Apatite 



Zircon 



Magnetite. . 

 Allanite 



Alaskite 

 Bullfrog 



AUotriomorphic 



Medium 

 Essential 

 Essential 

 Present 



Present 



Secondarj' 



Present 



Muscovite-granite 



Southern Klon- 

 dike 



AUotriomorphic 



Fine 



Predominant 



Essential 



Present 

 Present 

 Essential 



Biotite-muscovite- 



granite 

 Trapmann's 



Camp, Pahute 



Mesa 

 AUotriomorphic 



Fine to medium 



Essential 



Predominant 



Essential 



A little, both ori- 

 ginal and 

 secondary 



Essential 



Biotite-granite 

 Slate Ridge 



AUotriomorphic 



Coarse 



Essential 



Predominant 



Essential 



Biotite-granite 



Gold Mountain, 

 West End 



Hypidiomorphic 



Fine 



Predominant 



Essential 



Essential 



Essential 



Biotite-granite 



White Rock 



Spring, Pahute 



Mesa 

 Hypidiomorphic 



with orthoclase 



poikilitic 

 Coarse 

 Essential 

 Predominant 



Present 

 Essential 



Not abundant 



Biotite-granite 

 Silver Peak 



Hypidiomorphic 



Medium 

 Essential 

 Predominant 



Present 

 Essential 



Essential 



Biotite-granite 

 Gold Mountain 



Hypidiomorphic 



Coarse 



Essential 



Essential 



Present 

 Present 

 Essential 



Essential 



Biotite -granite 

 Lone IMountain 



Hypidiomorphic 



Medivam to coarse 

 Not abundant 

 Predo^minant 

 Present 



Essential 

 Present 



Biotite-hom- 



blende-granite 

 Belted Range 



Hypidiomorphic, 

 porphyritic 



Coarse 



Essential 



Predominant 



Present 

 Essential 



Essential 

 Essential 



Quartz-mon- 



zonite 

 Panamint 



Mountains 



Hypidiomorphic 



Medium 

 Present 

 Essential 

 Present 



Predominant 



Essential 

 Essential 

 Present 



Symbol x indicates that the mineral is present as an accessory. 



TABLE II 

 Porphyritic Rocks of Granular Siliceous Series 



Name and place Granite Porphyry 



Proportions of phenocrysts and 

 ground-mass 



Texture of ground-mass . 



Quartz of ground-mass . . . . 

 Orthoclase of ground-mass . 



Plagioclase of groimd-mass .... 

 Other constituents of ground-mass 



Quartz phenocrysts Predominant 



Orthoclase phenocrysts Essential 



Silver Peak 



Phenocrysts= 



Ground-mass 

 AUotriomorphic with 



areas micropeg- 



matitic 



Essential 

 Essential 



Plagioclase phenocrysts . 

 Microperthite '. 



Biotite phenocrysts 



Hornblende phenocrysts . 

 Accessory minerals 



Micropegmatite of quartz and 

 orthoclase 



L 



Present, Oligoclase- 

 albite 



Orthoclase pheno- 

 crysts microper- 

 thitic 



Rare 



Ground-mass, also 

 coronae around 

 phenocrysts; also 

 phenocrysts 



Granite Porphyry 

 Panamint 



Ground-mass > 



Phenocrysts 

 AUotriomorphic 



with areas micro- 



pegmatitic 



Essential 



Microcline and or- 

 thoclase predomi- 

 nant 



Oligoclase 



Biotite 



Predominant 

 Essential 



Present 



Magnetite, Titanite, 

 Apatite 



Ground-mass 



Granite Porphyry 

 Silver Peak 



Ground-mass > 

 Phenocrysts 



Hypidiomorphic 

 with micro-peg- 

 matitic areas 



Predominant 

 Essential 



Present 



Essential 

 Essential 



Present 



Orthoclase pheno- 

 crysts micro- 

 perthitic 



Rare 



Magnetite 

 Ground-mass 



Granite Porphyry 



Grapevine Moun- 

 tains 



Phenocrysts= 

 Ground-mass 



Hypidiomorphic 



Predominant 

 Essential 



Present 



Essential 

 Predominant 



Sparse 



Orthoclase pheno- 

 crysts micro- 

 perthitic 



Rare 



Magnetite, Zircon, 

 Apatite, Titanite 



Granite Porphyry 



Kawich 



Phenocrysts= 



Ground-mass 

 Hypidiomorphic 



Essential 

 Essential 



Essential 

 Predominant 



Present 



Present 



Magnetite, Zir- 

 con, Apatite 



Granite Porphyry 



Cactus Hills 



Phenocrysts > 



Ground-mass 

 Hypidiomorphic 



Essential 

 Essential 



Present 

 Biotite 



Subordinate 

 Predominant 



Sparse 



Essential 



Magnetite, Zir- 

 con, Apatite 



Granite Porphyry 



Gold Mountain 



Ridge 

 Phenocrysts > 



Ground-mass.- 

 Hypidiomorphic 



Essential 

 Predominant 



Present 

 Biotite essential 



Essential 



Microperthite and 

 microcline pre- 

 dominant 



Phenocrvsts 



Essential 



Magnetite, Apatite, 

 Titanite 



In ground-mass 



Quartz-monzonite 



Porphyry 

 Gold Mountain 



Ridge 

 Phenocrysts > 



Ground-mass 

 AUotriomorphic 



Predominant 

 Essential 



Present 



Biotite and Horn- 

 blende essential 



Orthoclase and mi- 

 microcline pre- 

 dominant 



Essential 



Magnetite, Titanite, 

 Zircon, Magnetite 



Quartz-monzonite 



Porphyry 

 Silver Peak Range 



Phenocrysts > 



Ground-mass 

 Hypidiomorphic with 



poikilitic areas, 



quartz enclosing 



others 

 Present 

 Essential 



Predominant 



Essential 



Predominant 



Essential 

 Present 

 Magnetite, 

 Apatite, Zircon, 

 Allanite 



