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Id 21
Identification Type Mineral
Name Amphibole
Distinguishing Features Pleochroic
Subhedral
Prismatic
Description Transparent colorless to green, brown, red, yellow, depending on mineralogy within the amphibole group. Strongly pleochroic. Moderate birefringence may be masked by color. Anhedral to euhedral prismatic grains. High relief. Hornblende-series minerals the most common detrital amphiboles.
Tags ferromagnesian
high-relief
green
silicate
transparent
green
External Resources Amphibole on MinDat
Imposters
Images
Unique Identification: Amphibole
Site name: Yellowstone
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: Classic amphibole with green-to-brown pleochroism, moderate birefringence, low extinction angle
Image Tags: greenish-brown good-cleavage
Unique Identification: Amphibole
Site name: Yellowstone
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: Classic amphibole with green-to-brown pleochroism, moderate birefringence, low extinction angle
Image Tags: moderately-birefringent cleavage
Unique Identification: Amphibole
Site name: Petit du Fresnoy
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Val Stanley
Notes: none
Image Tags: none
Unique Identification: Amphibole
Site name: Petit du Fresnoy
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Val Stanley
Notes: none
Image Tags: none
Unique Identification: Amphibole
Site name: Joseph Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: none
Unique Identification: Amphibole
Site name: Joseph Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: none
Unique Identification: Amphibole
Site name: Fish Lake, Kenai Peninsula, Alaska
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Magmatic amphibole phenocryst with a quenched volcanic glass rind. Isotropic glass visible as an irregular transparent fringe along grain boundaries.
Image Tags: prismatic ferromagnesian amphibole colored mafic-mineral moderate-birefringence quenched-rind volcanic-glass
Unique Identification: Amphibole
Site name: Fish Lake, Kenai Peninsula, Alaska
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Magmatic amphibole phenocryst with a quenched volcanic glass rind. Isotropic glass is extinct in cross-polarized light but visible as optical distortion on the birefringent surface of the grain.
Image Tags: prismatic ferromagnesian amphibole colored mafic-mineral moderate-birefringence quenched-rind volcanic-glass
Unique Identification: Amphibole
Site name: Yellowstone
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: Blue-to-green amphibole, rounded and worn
Image Tags: blue-green
Unique Identification: Amphibole
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Rounded hornblende prism and crystal fragment, pleochroic in greens, prismatic crystal-fragment
Image Tags: none
Unique Identification: Amphibole
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Guy Rothwell
Notes: AE 326 100 + 150, amphibole broken crystals cleavage fragments pleochroic
Image Tags: none
Unique Identification: Amphibole
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Guy Rothwell
Notes: AE 326 100 + 150, amphibole broken crystals cleavage fragments pleochroic
Image Tags: none
Unique Identification: Amphibole
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Guy Rothwell
Notes: AE 326 100 + 150, amphibole broken crystals cleavage fragments pleochroic
Image Tags: none
Unique Identification: Amphibole
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Guy Rothwell
Notes: pleochroic in greens, amphibole broken crystals cleavage fragments pleochroic
Image Tags: none
Unique Identification: Amphibole
Site name: Southeast flank of Nicaragua Rise, Caribbean Sea (15 52.72 N, 74 36.47 W)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Rounded hornblende prism, pleochroic in greens, prismatic crystal-fragment
Image Tags: none
Unique Identification: Amphibole
Site name: Mubwindi wetland
Light type: Scanning Electron Micrograph
Magnification: 3000.0
Submitted by: Mark Shapley
Notes: Prismatic amphibole; detrital
Image Tags: prismatic good-cleavage hexagonal hornblende SEM