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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: 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: 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: 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: Petit du Fresnoy
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Val Stanley
Notes: none
Image Tags: none
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: 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: 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