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Contents

Introduction. 5

Regional Volcanics. 8

Regional Rock Strata and Faults. 14

Relationship between Agate, Chert, and Quartzite. 17

Opal Transformation. 18

Temperature of Formation. 23

Coastal Volcanic Rock Types. 24

Lava dacite breccia. 24

Rhyolite geode shell—Cambria, CA.. 25

Rhyolite--Kanan Rd, CA.. 26

Rhyolite--Tranquillon, CA (Jalama Beach) 27

Ballen Silica--Glendora, CA.. 28

Andesite Symplectite--La Jolla, CA.. 30

Tuff-silica Breccia—Santa Monica Mtns., CA.. 32

Silica Minerals. 33

Citrine. 33

Melanophlogite. 34

Macroquartz. 37

Moganite. 38

Amethyst 39

Carnelian. 39

Chalcedony (Agate) Rose/Desert Rose. 40

Prasiolite. 41

Cristobalite. 43

Ribbon Radiolarite Chert 44

Radiolarian Chert 47

Herringbone Banding. 55

Banded Silica in Siliceous Ooze. 55

Calcite, Barite, Magnesite Minerals. 56

Foraminifera in Agate. 57

Caliche. 60

Calcite Imprints. 61

Barite Pseudomorphs. 62

Calcite Pseudomorphs. 63

Aragonite Pseudomorphs. 63

Calcite Swallowtail Hemispheres after Anhydrite. 64

Calcite Swallowtails after Anhydrite. 65

Calcite Needles. 65

Calcite Snowflakes. 66

Calcite Cottontails. 67

Vein Calcite/Aragonite. 67

Calcite Orbs. 68

Calcite/Dolomite Breccia with Quartz. 69

Dolo-silica, a combination of dolomite and silica. 70

Mag-silica, a combination of magnesite and silica. 71

Calcite Blades. 72

Monterey Diatomite. 73

Sulfides. 74

Millerite. 74

Pyrite. 75

Marcasite. 76

Amygdular Agates. 77

Amygdular Chevron Agates. 89

Amygdular Wall-Banded Agates. 90

Feather Agates. 92

Geodes. 93

Nodular Agates. 95

Vein Agates. 97

Sea Floor Sediment Structures. 103

Vein Agate Icicle/Pendant Structures. 104

Stratum Rocks. 112

Stratum Jaspers. 120

Serpentinized Calcite-opal (listvenite/listwanite) 121

Poppy Jasper. 122

Black Butte Reservoir Jaspers and Cherts. 123

Clay Mineralization. 128

Nipomo Sagenite (Calcite, Siderite) 130

Macrofossils. 131

Microstructures. 136

Organic Microstructures. 148

Bitumen Microstructures. 150

Kasper Jasper Press Titles. 153

 

 

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