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While externally similar shapes, these two minerals are very different inside.
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Corundum from
Cascade Canyon, Los Angeles County, California, USA


07238290017362375956953.jpg
Ruby, etc.

Cascade Canyon, Los Angeles County, California, USA
09242100017362375958870.jpg
Ruby

Cascade Canyon, Los Angeles County, California, USA
04224840017362375962362.jpg
Corundum

Cascade Canyon, Los Angeles County, California, USA
02440200017362375967786.jpg
Ruby

Cascade Canyon, Los Angeles County, California, USA
07238290017362375956953.jpg
Ruby, etc.

Cascade Canyon, Los Angeles County, California, USA
09242100017362375958870.jpg
Ruby

Cascade Canyon, Los Angeles County, California, USA
04224840017362375962362.jpg
Corundum

Cascade Canyon, Los Angeles County, California, USA
02440200017362375967786.jpg
Ruby

Cascade Canyon, Los Angeles County, California, USA
07238290017362375956953.jpg
Ruby, etc.

Cascade Canyon, Los Angeles County, California, USA
09242100017362375958870.jpg
Ruby

Cascade Canyon, Los Angeles County, California, USA
08374680017362375964725.jpg
Corundum

Cascade Canyon, Los Angeles County, California, USA
02440200017362375967786.jpg
Ruby

Cascade Canyon, Los Angeles County, California, USA
Locality type:Landslide
Classification
Species:Corundum
Formula:Al2O3
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Pyrite4
Muscovite1
- var Fuchsite1
Data
Mineral Data:Click here to view Corundum data
Locality Data:Click here to view Cascade Canyon, Los Angeles County, California, USA
Photo GalleryView Gallery (4 photos)
Data Identifiers
Mindat Occurrence Record ID:632728
Long-form Identifier:1:3:632728:6
GUID (UUID V4):0
Nearest other occurrences of Corundum
0.8km (0.5 miles) ⓘCascade Canyon, San Bernardino County, California, USA
2.3km (1.4 miles) ⓘUnnamed Corundum occurrence [1], Stoddard Peak, San Bernardino County, California, USA
5.4km (3.3 miles) ⓘSan Antonio Canyon Corundum, Claremont, Los Angeles County, California, USA
30.4km (18.9 miles) ⓘJensen Quarry, Jurupa Mountains, Jurupa Valley, Riverside County, California, USA
33.8km (21.0 miles) ⓘCrestmore quarries, Crestmore, Jurupa Valley, Riverside County, California, USA
44.2km (27.5 miles) ⓘCajalco Mine (Cajalco Tin Mine; Cajalco Dumortierite occurrence), El Cerrito, Riverside County, California, USA
77.7km (48.3 miles) ⓘUnnamed Corundum occurrence [1], Hemet, Riverside County, California, USA
81.5km (50.6 miles) ⓘUnnamed Corundum occurrences [2], Soboba Hot Springs (Ritchey Hot Springs; White Sulphur Spring), San Jacinto Mountains, Riverside County, California, USA
81.6km (50.7 miles) ⓘHazen Corundum prospect (Unnamed Corundum prospect), Soboba Hot Springs (Ritchey Hot Springs; White Sulphur Spring), San Jacinto Mountains, Riverside County, California, USA
82.7km (51.4 miles) ⓘHemet Magnesite Mine (Hemet Magnesite property), Winchester, Menifee Mining District (Auld Mining District), Riverside County, California, USA
References
Eaton, A. L. 1946. Pomona club collects at mineralized Cascade Canyon. The Desert Magazine, Volume 9 Number 10, August. Desert Press, Inc. El Centro, California, p. 31, 40pp.
 
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