• Samarskite from Nellore district - Part I. Uranium and earth acid contents

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/seca/025/05/0404-0407

    • Keywords

       

      Uranium; Photographic Plate; Tantalum Pentoxide; Columbium; Conchoidal Fracture

    • Abstract

       

      1. Sixty samples of samarskite were collected from a mica pegmatite vein in Nellore district, S. India.

      2. The physical and chemical properties of six representative samples from this collection were studied.

      3. Numbers 1 and 6 of the selected samples of samarskite were intergrown with Columbite-Tantalite.

      4. The specific gravity of these six specimens varies from 5·567 to 5·776. The hardness is between 5 and 6. The colour varies from dark steel grey to velvet-black and the streak is generally brown to dark-brown. They all break with conchoidal fracture.

      5. Specimen No. 1 which is an intergrowth of samarskite with Columbite-Tantalite was polished and placed in contact with a panchromatic photographic plate. Only the samarskite portion affected the photographic plate.

      6. The chemical analysis of samarskite shows a variation in UO3 percentage from 4·2 to 10·5% and the Nb2O5+Ta2O5 from 53·4 to 69·7%. Attention is drawn to the fact that the UO3 percentages of samarskite from the Nellore area differ from those of North Carolina.

    • Author Affiliations

       

      C Karunakaran1 K Neelakantam1

      1. Departments of Geology and Chemistry, Andhra University, Waltair
    • Dates

       
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