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Siderite

Siderite

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Modified: August 2022
Siderite Polished Siderite Rough
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Table of Contents
  • General Information
  • Siderite Colors
  • Alternate Names
  • Countries of Origin
  • Care

Siderite was discovered in 1845 and derives its name from the Greek sideros (iron). Siderite has perfect cleavage in three directions and comes in a wide variety of crystal habits and colors.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Siderite
Species
Siderite
Transparency
Translucent
Dispersion
Strength: Strong Fire
Refractive Index
Over The Limit 1.633-1.875
Birefringence
0.215- 0.242
Optic Character
Uniaxial
Optic Sign
Negative
Polariscope Reaction
Aggregate (AGG), Doubly Refractive (DR)
Fluorescence
SWUV: Inert
LWUV: Inert
CCF Reaction
None
Pleochroism
None
Hardness
3.5-4.5
Streak
White
Toughness
Poor
Inclusions
Aggregates can be fibrous.
Luster
Vitreous, Silky, Pearly
Stability
Brittle
Fracture
Uneven, conchoidal
Cleavage
Perfect in 3 directions
Chemical Name
Iron Carbonate
Chemical Formula
Fe2+CO3
Crystal System
Hexagonal
Chemistry Classification
Carbonate

Siderite Colors

  • Black Siderite
    Black
  • Brown Siderite
    Brown
  • Colorless Siderite
    Colorless
  • Gray Siderite
    Gray
  • Green Siderite
    Green
  • Red Siderite
    Red
  • White Siderite
    White
  • Yellow Siderite
    Yellow

Alternate Names

Chalybite

Countries of Origin

Papua New Guinea; Kazakhstan; Portugal; Iceland; Greece; Mongolia; Korea (the Republic of); Morocco; Unknown; Mali; Luxembourg; Panama; Brazil; Guyana; Iraq; Jersey; Slovenia; Nepal; Iran (Islamic Republic of); Hungary; Isle of Man; Japan; Ukraine; Ghana; Zambia; Taiwan (Province of China); India; Lao People's Democratic Republic; New Zealand; Canada; Turkey; Namibia; Finland; Italy; South Africa; Georgia; Jamaica; Peru; Turkmenistan; Venezuela (Bolivarian Republic of); Germany; Tanzania, United Republic Of; Russian Federation; Viet Nam; United States of America; Madagascar; Thailand; United Kingdom of Great Britain and Northern Ireland; Libya; Saudi Arabia; Netherlands; Sweden; Pakistan; Malawi; China; Ireland; Poland; Slovakia; France; Nigeria; Serbia; Tunisia; Kyrgyzstan; Romania; Falkland Islands [Malvinas]; Togo; Rwanda; Uzbekistan; Kenya; Switzerland; French Polynesia; Spain; Mauritania; Norway; Mexico; Zimbabwe; Israel; Australia; Greenland; Tajikistan; Indonesia

Care

Soluble in warm hydrochloric acid and slightly soluble in water.

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