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How to identify Gold in Quartz

Native Gold (Au) in Quartz (SiO2)

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To correctly identify Gold in Quartz (Native Gold (Au) in Quartz (SiO2)), check each of these features in order. Many rocks and minerals look alike, so cross-reference multiple properties before deciding.

Step-by-step identification

  1. 1

    Color

    Overall color and any zoning or banding

    Gold: Bright metallic yellow to brassy yellow. Quartz: Colorless, white, gray, or translucent.

  2. 2

    Luster

    How the surface reflects light: metallic, vitreous, dull

    Gold: Metallic, bright. Quartz: Vitreous (glassy) to greasy.

  3. 3

    Texture

    Grain size and surface feel: coarse, fine, glassy

    Gold: Often irregular, flaky, dendritic, or wire-like within the quartz. Quartz: Crystalline, granular, or massive.

  4. 4

    Crystal Form

    Shape of visible crystals or crystal faces

    Gold: Typically anhedral masses, flakes, wires, or rarely small octahedral/dodecahedral crystals. Quartz: Hexagonal prisms with pyramidal terminations, massive, or granular.

  5. 5

    Cleavage

    How it breaks: flat cleavage planes vs irregular fracture

    Gold: None. Quartz: None (conchoidal fracture).

  6. 6

    Geological Environment

    The rock formation and setting where it occurs

    Hydrothermal veins, shear zones, fault systems, often associated with granitic intrusions, volcanic activity, or metamorphic terrains.

Key Facts

Hardness
Gold: 2.5-3 (Mohs). Quartz: 7 (Mohs).
Specific Gravity
Gold: 19.3 (pure, but can vary with alloys). Quartz: 2.65.
Crystal System
Gold: Isometric. Quartz: Trigonal.
Color
Gold: Golden yellow. Quartz: Colorless, white, gray, purple, pink, brown, black.
Luster
Gold: Metallic. Quartz: Vitreous to greasy.
Transparency
Gold: Opaque. Quartz: Transparent to translucent.
Fracture
Gold: Hackly. Quartz: Conchoidal.
Cleavage
Gold: None. Quartz: None.
Composition
Gold: Native element (Au), often alloyed with silver (electrum). Quartz: Silicon dioxide (SiO2).

Physical characteristics

  • Crystal Habit: Gold: Anhedral masses, flakes, wires, dendritic growths, rarely small crystals. Quartz: Prismatic crystals, massive, granular.
  • Cleavage Type: Gold: None. Quartz: None.
  • Fracture Type: Gold: Hackly. Quartz: Conchoidal.
  • Tenacity: Gold: Malleable and ductile. Quartz: Brittle.
  • Luster Type: Gold: Metallic. Quartz: Vitreous.

Explore Gold in Quartz

Overview

Full guide to Gold in Quartz

Localities & Collecting

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