1. Igneous Rocks -- II Intermediate Rocks Acidic Rocks

2. Classifications: minerals & chemical compositions

3. Intermediate Rocks TextureAlkali feldspar < 1/3 Alkali feldspar >1/3 < 2/3 Alkali feldspar >2/3 Feldspathoidal Volcanic rocks AndesiteTrachyandesite (latite) TrachytePhonolite Plutonic rocks DioriteMonzoniteSyeniteFeldspathoidal syenite

4. Diorite Definition: is intrusive, holocryatalline, phaneritic, containing: Plagioclase (oligoclase or andesine)----- 55~70% Mafic (commomly hornblende or biotite)---- - 40~25%

5. Diorite: Plag+ Mafic ( Hb, Cpx, Bi)

6. Trachytoid Diorite

7. Andesite Definition: is volcanic and hypabyssal intrusive, holocryatalline or hypocrystalline, with matrix aphanetic, containing: Plagioclase (oligoclase or andesine)----- 55~70% Mafic (commomly hornblende or biotite)---- - 40~25%

8. Andesite: Plag+Mafic (Cpx, Hb, Bi)

9. Porphyritic Andesite

10. High-Mg andesite: Plag+Opx+Ol

11. Tonolite (quartz andesite) Definition: is intrusive, plutonic and hypabyssal, holocryatalline, phaneritic, containing: Sodic plagioclase (oligoclase or andesine)-- ---50~80% Quartz ---- 35~10% Mafic (biotite and hornblende)----- 35~10%

12. Tonalite: Plag+Mafic (Bi, Hb) +quartz (< 10%)

13. Dacite (quartz andesite) Definition: is volcanic and hypabyssal intrusive, holocryatalline or hypocrystalline, with matrix aphanetic, containing: Sodic plagioclase (oligoclase or andesine)-- ---50~80% Quartz ---- 35~10% Mafic (biotite and hornblende)----- 35~10%

14. Dacite: Plag+Mafic (Bi, Hb) +quartz (< 10%)

15. Monzonite Definition: is intrusive, Plutonic or hypabyssal, holocryatalline, phaneritic, containing: Mafic (hornblende, biotite, augite)----- 15~60% Sodic Plagioclase (oligoclase or andesine)-- ---50~30% Potash feldspar (orthoclase) ----- 45~25%

16. Monzonite: Plag+K-feldspar +Mafic (Bi, Hb, Aug)

17. Latite Definition: is volcanic and hypabyssal intrusive, holocryatalline or hypocrystalline, with matrix aphanetic, containing: Mafic (hornblende, biotite, augite)----- 15~60% Sodic Plagioclase (oligoclase or andesine)-- ---50~30% Potash feldspar (orthoclase) ----- 45~25%

18. Syenite Definition: is intrusive, Plutonic or hypabyssal, holocryatalline, phaneritic, containing: Alkali feldspar (orthoclase) ----- 30~80% Sodic Plagioclase (oligoclase or andesine)-- ---5~25% Mafic (hornblende, biotite, augite)----- 40~10%

19. Syenite: K-feldspar+ Plag +Mafic (Bi, Hb, Px)

20. Trachyte Definition: is volcanic and hypabyssal intrusive, holocryatalline or hypocrystalline, with matrix aphanetic, containing: Alkali feldspar (orthoclase) ----- 45~80% Sodic Plagioclase (oligoclase or andesine)-- ---5~25% Mafic (hornblende, biotite, augite)----- 30~10%

21. Trachyte: K-feldspar+ Plag +Mafic (Bi, Hb, Px)

22. Acidic rocks or Silicic Rocks Granite Rhyolite Granodiorite Quartz latite

23. Granite Definition: is plutonic, intrusive, and hypabyssal, holocryatalline, phaneritic, containing: Quartz ----- 10~40% Potash feldspar ----- 30~60% Sodic plagioclase (excluding perthite)----- 0~35% Mafic (biotite, hornblende)----- 40~25%

24. Calc-alkali granite Perthitic orthoclase or microcline Oligoclase or rarely andesine Hornblende Diopside or augite Alkali granite Strongly perthite orthoclase or microcline, anorthoclase Albite or sodic oligoclase Iron-rich biotite Hastingsite, arfvedsonite, riebeckite Aegirine-augite, rarely hedbergite

25. Granite

27. Granite: Or + Qz + Mica (Bi, Mus)

29. Microcline

30. Perthite

31. Alkali granite: Or + Qz + Alkali Hb

32. Rhyolite Definition: is volcanic and hypabyssal, holocryatalline or hypocrystalline, with matrix aphanetic, containing: Quartz ----- 10~40% Potash feldspar ----- 30~60% Sodic plagioclase (excluding perthite)----- 0~35% Mafic (biotite, hornblende)----- 40~25%

33. Rhyolite

35. Obsidian

36. Rhyolite: Or + Qz

38. Rhyolite: Or + Qz

39. Pumice

40. Granodiorite Definition: is plutonic and intrusive, holocryatalline, phaneritic, containing: Potash feldspar ----- 20~40% Sodic plagioclase-----25~45% Quartz ----- 35~10% Mafic (biotite, hornblende)----- 30~10%

41. Granodiorite: Or + Plag + Qz + Mafic (Bi, Hb)

42. Granodiorite: Or + Plag + Qz + Mafic (Bi, Hb)

43. Quartz latite Definition: is volcanic and hypabyssal, holocryatalline or vitrous, with matrix aphanetic, containing: Potash feldspar ----- 20~30% Sodic plagioclase-----30~50% Quartz ----- 35~10% Mafic (biotite, hornblende)----- 20~10%

44. Ultrabasic and basic rocks

45. Classifications: minerals & chemical compositions

46. Definition Peridotite is holocrystalline, phaneritic, plutonic rocks; containing Mafic (Ol, Px, Hb) --------- 85-95% Ores (magnetite, ilmenite, chromite)---10- 3% Calcic plagioclase ------< 5%

48. Classification Peridotite ---- group name Ol ------- Dunite Ol + OPX (En or Hy) ----Harzburgite Ol + CPX (aug) -------- Wehrite Ol + OPX + CPX ---- Lherzolite Ol + Hb -------- Cortlandtite Px (CPX + OPX) ----- Pyroxenite Hb ---------- Hornblendite Kimberlite --- mica peridotite

49. Dunite — olivine + chromium-rich spinel

50. Harbuzite — Olivine + OPX

51. Wehrite — Olivine + CPX

52. Lherzolite — Olivine + OPX + CPX

53. Garnet peridotite

54. Pyroxenite--- CPX + OPX

55. Hornblendite- -- Hb

56. Kimberlite --- mica peridotite

57. Fine-grained ultramafic rocks Komatiite ankaramite --- Diopside augite Limburgite --- Augite Katungite --- melilite-rich Ol leucitite Ugandite --- melanocratic Ol leucitite Melilitite & nephelinitite --- nepheline basalt Basanite

58. Komatiite

59. Leucitite

61. Meymechite

62. Basanite

63. Ultramafic vs. Ultrabasic Mafic mineral: > 70% Ultramafic  ultrabasic SiO2 < 45 wt% Ultrabasic ~ ultramafic Ex. Carbonatite, anorthosite

64. Carbonatite

65. Basic rocks Volcanic rocks: Tholeiite: Cpx+Plag Alkali basalts: Plag+Cpx+Ol Picrite: Ol  Plag Plutonic Rocks Diabase Gabbro: Plag + Cpx Norite: Plag + Opx Eucrite: Calcic Plag + Opx Troctolite: Ol +Plag Anorthosite: Plag  Mafic

66. Gabbro Definition: is intrusive, plutonic, holocrystalline, phaneritic rocks. Containing: Mafic (aug, Hy, or Ol less commomly Hb) ---25- 50% Plagioclase (labradonite or bytownite) ---- 70- 45%

67. Classifications Gabbro --- Aug + Calcic Plag Ol-gabbro --- Aug + Ol + Calcic Plag Troctolite --- Ol + Calcic Plag Norite --- Hy + Calcic Plag Anorthosite --- Ol + Calcic Plag

68. Diabase (dolerite) Definition: is intrusive, hypabyssal, normally holocrystalline Containing Mafic (aug, Hy, less commomly Ol) ---65- 25% Plagioclase (labradonite or bytownite) ---- 30-70%

69. Basalts Definition: is volcanic and uncommonly hypabyssal intrusive, holocrystalline, hypocrystalline rarely vitrous matrix aphanitic. Containing Plagioclase (labradonite) ---- 40-60% Mafic (aug, Ol) ---55-35%

70. Tholeiitic basalt: Cpx  Plag ± Ol

71. Alkali basalt: Plag + Ol  Cpx

72. Lunar low-Ti basalt: Plag + Ol  Cpx

73. Lunar high-Ti basalt: Plag  Cpx ± Ol

74. Picrite basalt: Ol  Cpx±Plag

75. Glassy groundmass

76. Vesiculated basalt

77. Gabbro: Plag+Cpx

78. Alkali gabbro: Plag+Cpx±Ol

79. Alkali Gabbro: Plag+Ol+Cpx±K- feldspar or ±Feldspathoid

80. Basic dike rocks Diabase

81. Norite: Plag+Opx

82. Anorthosite: Plag ± Mafic (< 10%)