Allanite-(Nd) from
Kingman Feldspar Mine (Kingman Feldspar Quarry), Wallapai Mining District, Cerbat Mountains, Mohave County, Arizona, USA
| Locality type: | Mine | |
| Classification | ||
|---|---|---|
| Species: | Allanite-(Nd) | |
| Formula: | (CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH) | |
| Comments: | Allanite occurs associated with biotite as large pods of euhedral to subhedral, metamict and extensively fractured crystals in the wall zone of the pegmatite. The allanite is dark brown to black in color and is mildly radioactive. Pods reach over 0.4 m in length, with the largest one showing intergrowth with another pod. On all of the exposed surfaces, the allanite was coated with a red crust of oxidized iron. Within the allanites were small (0.3 cm) inclusions of thorogummite. Analyses presented by Brown (2010) show that the majority of allanites from here are Nd-rich allanite-(Ce), with a Nd/Ce ratio ranging from 0.6 to 0.85, but a very few analyses show a Nd/Ce ration between 0.9 and 1.1. Those with a Nd/Ce ratio higher than 1 are classified as allanite-(Nd). The only way to identify allanite-(Nd) is to perform a qualitative analysis on individual specimens. Assuming that Brown (2010) has used a representative selection, between 1% and 5% of the specimens should show the presence of allanite-(Nd). | |
| Habit: | euhedral to subhedral, metamict and extensively fractured crystals | |
| Colour: | dark brown to black | |
| Confirmation | ||
| Validity: | Believed Valid | |
| Associated Minerals: | ||
| Associates: | Allanite-(Ce) Thorogummite | |
| Associated Minerals Based on Photo Data: | ||
| Allanite-(Ce) | ⓘ4 photos of Allanite-(Nd) associated with Allanite-(Ce) at this locality. | |
| Bastnäsite-(Ce) | ⓘ1 photo of Allanite-(Nd) associated with Bastnäsite-(Ce) at this locality. | |
| Data | ||
| Mineral Data: | Click here to view Allanite-(Nd) data | |
| Locality Data: | Click here to view Kingman Feldspar Mine (Kingman Feldspar Quarry), Wallapai Mining District, Cerbat Mountains, Mohave County, Arizona, USA | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 719693 | |
| Long-form Identifier: | 1:3:719693:5 | |
| GUID (UUID V4): | deb3b9c4-72ed-4ff3-b350-bcb1fb4875bf | |
| References | ||
Kingman Feldspar Mine, Wallapai Mining District, Cerbat Mountains, Mohave County, Arizona, USA