🪙 Fool's Gold vs Real Gold: Streak, Panning & Hammer Test Lab
Hammer Dent vs Shatter • Porcelain Streak • Gold Pan Inertia • Acid & Magnet Check (60FPS)
Excited by brassy flashes in your creek pan or quartz vein—only to wonder whether it's real Au or cruel Pyrite, Chalcopyrite, or sunny Mica? Run the classic 5-Test Prospector Forensics: Pin/Hammer Malleability, Porcelain Streak, Panning Sink Rate (SG), Magnet Pull, and Nitric Acid!
Native Gold (Placer / Lode Au) • TRUE GOLD CONTROL
24K Placer Gold Flake (SG 19.3): Heavy! Stays dead at the pan rim, bends like lead, and streaks bright buttery gold!
Wait — Did You Know?Even a millimeter-wide speck of real placer gold stays pinned heavy as lead at the bottom lip of your pan while black magnetite sands and yellow mica flakes wash away effortlessly.
Select Mineral or Control Specimen (8 Profiles)
Click crystal specimen to run Hammer/Scratch/Pan impact, or drag Test Tools!
Hammer Strike Force, Pan Water Swirl & Acid/Magnet Probe
Test brittleness under steel, hydraulic swirl inertia & magnet/streak reactions
Hammer Force75%
Pan Swirl Flow62%
Acid / Magnet50%
Prospector Forensic Telemetry
Live Simulator Readout
Specific GravitySG 15.5-19.3!
Porcelain StreakGOLD Streak
Field VerdictTRUE NATIVE GOLD
The Pin & Pan Golden Rule: Real gold NEVER sparkles in changing light like flat mica mirrors—it shines the same rich buttery yellow from EVERY angle, bends instead of snapping, and resists household acids.
How The Crystal Physics Works (3-Step Flowchart)
Visual Mechanism Breakdown
1. Specific Gravity Anchoring
Natural gold weighs 7x more than creek sand (SG 19.3 vs 2.65) and nearly 4x more than Pyrite (SG 5.0). Proper shaking drops real gold straight down to the steel-pan crease.
2. Malleable Metal vs Ionic/Covalent Sulfides
Metallic bonds in Gold let whole planes of atoms slide smoothly without snapping (you can hammer 1 gram into 1 m2 of leaf). Sulfides like Pyrite have directional brittle bonds that shatter cleanly under a sewing pin.
3. Oxide Tarnish & Streak Powder
Grinding any metallic sulfide on unglazed porcelain exposes its true dark iron-copper-sulfur dust (black/green). Gold smears pure malleable gold metal.
Specific Gravity Separation in a Gold Pan (Density g/cm³)
Comparative Mineral Property Scale
Quartz Gangue & Weathered MicaSG 2.65 - 2.9 (Flushes Over Pan Lip Immediately)
Iron Pyrite & MarcasiteSG 4.9 - 5.0 (Lags Behind Quartz, Lighter Than Au)
Arsenopyrite & Galena Heavy SandsSG 6.1 - 7.6 (Concentrates Near Gold Tail)
Natural 22K-24K Placer Gold (Au)SG 15.5 - 19.3! (Sinks Like Lead Anchor!)
Quick Field Myth vs. Fact Check
Common Collector Misconceptions
❌ MYTH: Real gold is always soft enough to bend easily in your fingers, and never looks silvery or coppery.
✅ FACT: Thin flakes fold effortlessly, while thick nuggets resist fingers; moreover natural electrum (>20% Ag) looks pale lemon-silver while high-Cu gold looks reddish!
❌ MYTH: If a shiny rock doesn't react to acid and isn't magnetic, it's guaranteed gold.
✅ FACT: Gold Quartz-embedded Pyrite grains resist vinegar/HCl cleanly AND are non-magnetic—always check streak + malleability + SG!
❌ MYTH: Pyrite has zero relationship with real gold deposits.
✅ FACT: Hydrothermal Pyrite and Arsenopyrite are the world's top gold pathfinders—Carlin-type deposits lock billions in sub-microscopic gold inside arsenian pyrite rims!
60-Second Pocket Field Test Checklist
Shadow Test in the Creek: cup your hand over sunlit shiny flakes in water—Golden Mica drops dull brown in shadow, while real placer Gold stays unmistakably bright yellow.
Pin Poke Under 10x Loupe: press a sharp steel needle straight down onto the suspect speck. Gold smoothly dents/smears like warm wax; Pyrite or Chalcopyrite cracks or flies apart.
Porcelain Toilet-Tank Lid Trick: scrape the mystery rock firmly across unglazed ceramic. Gold leaves a shining metallic yellow smear; Pyrite/Chalcopyrite/Arsenopyrite draw ugly greenish-black.
Drop & Magnet Check: sweep a strong magnet wrapped in plastic over dried black concentrates to pull out Pyrrhotite and Magnetite before tweezing final color specks.
Collector Caution & Fake Alert: Beware 'high-grade gold ore' specimens on online auctions sprinkled with crushed brass filings or bright iridescent 'bornite/chalcopyrite peacock ore' marketed as unrefined gold—genuine gold leaf/wire bends cleanly without flaking green-black powder.
Collector Field Guide & Mineralogy Deep Dive
Scientific Reference Notes
⚖️ Why Nothing Rivals Gold's SG 19.3 in Creeks
In fast mountain rivers, water lift scales inversely with submerged density (SG - 1). Because Gold's effective submerged weight (18.3) overwhelms Pyrite (4.0) and Mica (1.8), gold sinks swiftly behind boulders and inside bedrock crevices.
🌈 How Chalcopyrite Becomes 'Peacock Ore'
Fresh Chalcopyrite is rich brassy yellow (often indistinguishable from gold specks to beginners), but dipping in mild acid or warm mine air grows a nanometer-thin bornite/covellite/iron-oxide interference film—blazing electric purple and blue.
Ironically, tossing every piece of Pyrite away can waste ore! In Nevada's Carlin Trend, hydrothermal fluids trap invisible atomic Au+ ions inside arsenic-rich Pyrite rims—requiring roasting or autoclave oxidation before cyanidation recovers the gold.
🏺 Safe Handling of Sulfide Lookalikes
Unlike inert noble Gold, Arsenopyrite carries ~46% arsenic while Marcasite can leach sulfuric acid on damp skin/shelves. Keep lookalike field finds bagged dry and always wash hands after hammering or streaking.
Diagnostic Specimen Comparison Table
Quick Laboratory & Field Reference
Mineral / Control
Chemistry / System
Property
Diagnostic Signal
Classic Source
Native Placer Gold
Au (Ag/Cu)
2.5 - 3.0 (Ductile)
15.5 - 19.3
Bright Metallic Gold
Dents silently; never crumbles
Pyrite
FeS2 (Cubic)
6.0 - 6.5 (Brittle)
5.0
Greenish-Black
Harder than knife; brassy cubes
Chalcopyrite
CuFeS2
3.5 - 4.0 (Brittle)
4.2
Greenish-Black
Knife scratches, but pin crushes
Marcasite
FeS2 (Ortho)
6.0 - 6.5 (Brittle)
4.9
Gray-Black
Pale tin-yellow; rots in humidity
Pyrrhotite
Fe(1-x)S
3.5 - 4.5 (Brittle)
4.6
Dark Gray-Black
Magnetic bronze luster
Golden Mica
Phlogopite/Biotite
2.0 - 2.5 (Elastic)
2.8 - 3.1
White / Colorless
Floats off pan; dead in shadow
Arsenopyrite
FeAsS
5.5 - 6.0 (Brittle)
6.1
Black
Garlic smell when hammered!
Frequently Asked Mineralogy Questions
Collector & Lab Answers
What is the fastest 100% reliable field test between Real Gold and Fool's Gold?
Combine two fast checks: poke it firmly with a sharp steel needle/pin (real gold silently dents or smears like soft lead, whereas Pyrite and Chalcopyrite crack or crumble into black grit) and rub it on unglazed ceramic (gold streaks bright yellow; sulfides streak greenish-black).
Why did my 'gold' scratch easily with a pocketknife like soft metal, yet still turn out fake?
You almost certainly found Chalcopyrite (Mohs 3.5-4) or Golden Mica (Mohs 2.5)! Both are softer than steel (5.5), fooling people who only know Pyrite is hard (6.5). Under a pin press, Chalcopyrite fractures into powder and Mica splits into transparent flakes—unlike Gold.
Why do golden flakes shimmer like crazy in shallow creek water and then disappear in a pan?
Those are iron-stained weathered Biotite or Phlogopite Mica sheets (SG ~2.8). Flat cleaved plates reflect sunlight like tiny mirrors only at specific angles, whereas real Gold keeps a steady buttery luster in shadow and stays anchored at the bottom of your pan.
Does Pyrite ever actually contain real Gold?
Yes—frequently! While pure Pyrite is iron sulfide, gold-bearing hydrothermal solutions often precipitate Pyrite alongside metallic Gold or trap invisible micron-scale Au atoms inside arsenian Pyrite crystals, making it a prime hard-rock prospecting indicator.