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Id 14
Identification Type Mineral
Name Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Distinguishing Features Translucent
Transparent
Granular
Description Non-opaque iron oxides, hydroxides, and oxyhydroxides including hematite (which may also occur as opaque grains) and limonite (actually a mixture of minerals including goethite). Red to brown; limonite yellower. High relief. May occur as granular aggregates, scales, either translucent or transparent. May be isotropic or show low-order birefringence.

Hematite is red to brown, transparent to opaque. Red-brown in reflected light. Hematite has high birefringence, but may not be observable due to deep color of grains. Some hematite grains may be noncrystalline and thus isotropic. Irregularly shaped flakes and earthy or somewhat fibrous particles. High relief. Hematite occurs as detrital or authigenic/diagenetic grains.
Tags red
brown
yellow
External Resources Iron (Hydr)oxides, Non-opaque (Hematite/Limonite) on MinDat
Imposters
Images
TAS-MACK11-1A-2B-1_5.5cm_hematite_pp-600.jpg
Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Lake Mackenzie
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: Hematite red brown transparent translucent opaque isotropic oxide heavy-mineral
TAS-MACK11-1A-2B-1_5.5cm_hematite_cp-600.jpg
Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Lake Mackenzie
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: Hematite red brown transparent translucent opaque isotropic oxide heavy-mineral
HECI-URSW10-2-73cm_a-600.jpg
Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Urswick Tarn
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: Hematite red brown transparent translucent opaque isotropic oxide heavy-mineral
HECI-URSW10-2-73cm_b-600.jpg
Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Urswick Tarn
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: Hematite red brown transparent translucent opaque isotropic oxide heavy-mineral
iron_oxides_pp_BVG-600.jpg
Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Tasmania
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: orange brown altered
Image Tags: none
iron_oxides_cp_BVG-600.jpg
Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Tasmania
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: orange brown altered
Image Tags: none
clay_matrix_with_calcite_needles_2_xp_JS-600.jpg
Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: R.K.
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Joe Smoot
Notes: matrix shows low birefringence, needles have high birefringent margins
Image Tags: none
clay_matrix_with_calcite_needles_2_JS-600.jpg
Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: R.K.
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Joe Smoot
Notes: vermiform texture in matrix with many needle-like clear forms
Image Tags: none
ironoxide_40x_pp-600.jpg
Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: LacCore reference collection
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: none
5A-1G-1_10cm_hemacoatpp630-600.jpg
Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Medicine Lake, MT
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Patchy hematite precipitation on a rounded feldspar sand grain. Fine carbonate grains also adhere to the grain surface.
Image Tags: amorphous red colored oxide
5A-1G-1_10cm_hemacoatcp630-600.jpg
Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Medicine Lake, MT
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Patchy hematite precipitation on a rounded feldspar sand grain. Strong reddish-brown color obscures birefringence. Fine carbonate grains also adhere to the grain surface.
Image Tags: amorphous red colored oxide
calcite_ironoxide_40x_pp-600.jpg
Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: LacCore reference collection
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: iron oxides replacing rim of calcite grain
Image Tags: pseudomorphing
calcite_ironoxide_40x_cp-600.jpg
Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: LacCore reference collection
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: none
GLAD7-MAL05-1B-9E-1_76.1irongoopyr-600.jpg
Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Malawi
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: AM
Notes: none
Image Tags: none

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