Rotate a jet-black Hypersthene cabochon under a lamp and suddenly a razor-sharp curtain of molten pewter, bronze, or copper fire wakes up inside the rock! Spanning the classic mantle Orthopyroxene chain from green Enstatite (MgSiO3) to iron-rich Bronzite and Hypersthene, exsolved nano-plates of Ilmenite and Hematite stack cleanly along the (100) plane. Dial up Iron % to track refractive shifts, spin the schiller mirror, and spot synthetic glass lookalikes.
Dark Silver-Bronze Hypersthene Cab • Liquid Pewter Mirror
Hypersthene (Fs30-50): Packs enough iron for deep chocolate-black contrast, throwing dazzling molten silver-copper cat's-eye flash!
Wait — Did You Know?Lapidaries who cut a rough Hypersthene block blindly get a dull dark rock—only orienting the cab dome strictly parallel to the crystallographic (100) plane ignites that silky electric bronze lightning band!
Select Specimen or Control Sample (8 Profiles)
Click any orthopyroxene member or gem variety to compare Fe2+ content, cleavage angle, and optical flash:
Slide Iron % from 0% Enstatite through 25% Bronzite to 45% Hypersthene—then tilt to ignite copper schiller!
Cabochon Schiller Tilt42 deg
Iron (FeSiO3) Mol %38%
(100) Ilmenite Exsolution82%
Orthopyroxene Chain-Silicate Fe/Mg Ratio & Schiller Telemetry
Live Diagnostic Telemetry
FeSiO3 CompositionMohs 5.5-6.0 | SG 3.45-3.60
Hardness / Specific GravityRI 1.69-1.73 | Cat's-Eye Band
Optical Luster & CleavageMust Cut Parallel To (100)!
Name Origin: From Greek 'above strength'—referring to how Hypersthene is noticeably harder and heavier than soft hornblende lookalikes!
Why does this happen atom-by-atom? Read the 3-step physics strip below, then keep scrolling for Chapter 2 (Microscopic Atomic Zoom) and Chapter 3 (Interactive Real vs. Fake Split Loupe).
How The Crystal Physics Works (3-Step Flowchart)
Visual Mechanism Breakdown
1. Deep Mantle Magma Grows Orthopyroxene Chains
At extreme mantle or gabbro temperatures (~1,000°C), Mg2+, Fe2+, and trace Titanium cram effortlessly into single-chain [SiO3]2- crystals.
2. Slow Cooling Forces Titanium-Iron Exsolution
As rock cools slowly inside anorthosite/norite chambers, trapped Fe & Ti precipitate as parallel wafer-thin Ilmenite & Hematite mirrors stacked along (100).
❌ MYTH: Hypersthene gets its metallic flash from raw pure native bronze or copper metal veins.
✅ FACT: False! The metallic flash comes from sub-microscopic iron-titanium oxide plates (mostly Ilmenite and Hematite) exsolved neatly inside dark silicate pyroxene.
❌ MYTH: If a Hypersthene bead looks flat black from most angles, it must be low quality or dyed black onyx.
✅ FACT: On the contrary, high-grade Hypersthene MUST stay stealthy velvet black away from the (100) mirror axis—that high dark-to-flash contrast is precisely what makes fine cabochons dramatic!
❌ MYTH: Bronzite and Hypersthene are completely unrelated mineral species with different crystal systems.
✅ FACT: They sit side-by-side in the same continuous orthorhombic Enstatite–Ferrosilite (MgSiO3–FeSiO3) solid solution series, differing strictly by Iron-to-Magnesium percentage!
Chapter 3 of 3 • Interactive Real vs. Fake Split Loupe
Authentic Specimen vs. Fake / Impostor Drag-Loupe
Drag the divider left/right — toggle Probe Mode for forensic lighting, cleavage & bubble inspection.
60-Second Pocket Field Test Checklist
Sweep a single penlight slowly across the cabochon face: genuine Hypersthene/Bronzite flares explosively ONLY across one crystallographic mirror direction (~180° opposite each side), never in 360° glitter.
Inspect broken rough cleavage corners: Orthopyroxene cleaves cleanly at nearly 88°/92° angles, whereas Hornblende/Amphibole flashes fibrous splinters at 56°/124°.
Check Star Enstatite vs Black Star Diopside: near-90° cross-arms indicate orthorhombic Star Enstatite, whereas slanted ~73° asymmetric arms reveal monoclinic Diopside.
Heft in hand to rule out Brown Goldstone glass: SG 3.45 Hypersthene feels substantially heavier than SG 2.65 copper-glass imitations.
Collector Caution & Fake Alert: FYI for rockhounds & mineral labels: Technically the IMA reclassified traditional 'Bronzite' and 'Hypersthene' as Fe-bearing Enstatite (En50-100) and Mg-bearing Ferrosilite (Fs50-100)—yet gemologists and crystal collectors still universally use Hypersthene and Bronzite for metallic-schiller cabs!
Collector Field Guide & Mineralogy Deep Dive
Locality, Chemistry & Optical Notes
⚒️ Why Cutters Sweat Over Rough Hypersthene
Unlike homogeneous Quartz, Hypersthene only shows silky silver-bronze schiller perpendicular to its (100) plate stack—AND its two 88° cleavage planes love to chip along grinding wheels. Master cabbers pre-wet rough boulders to hunt the flash before slicing slabs!
🧪 Reading The Enstatite-Ferrosilite Compass
Every step up from 0% Iron (Enstatite) -> 12–30% Fe (Bronzite) -> 30–50% Fe (Hypersthene) raises specific gravity (3.20 -> 3.60), bumps refractive index (1.65 -> 1.73), and darkens background body color so the exsolved metallic band pops harder.
🪨 Host Rocks: Norite, Gabbro & Anorthosite
Famous Labrador (Canada) and Bamble (Norway) Hypersthenes crystallize alongside blue Labradorite inside massive deep-crust anorthosite-norite plutons—where slow billion-year cooling gave FeTiO3 ample time to organize.
☄️ Planetary Clue Inside Asteroid 4 Vesta
NASA's Dawn spacecraft confirmed Vesta's deep crust is choked with magnesium-rich Orthopyroxene just like terrestrial Bronzite—making small Diogenite meteorites tiny slices of shattered protoplanet mantle!
Diagnostic Specimen Comparison Matrix
Quick Laboratory & Collector Reference
Mineral / Control
Formula & System
Key Physical Metric
Diagnostic Tell
Classic Locality
Hypersthene
(Mg,Fe)SiO3 (Fs30-50)
Mohs 5.5-6.0 | SG 3.5
Jet black body + blazing silver-bronze flash
Labrador / Norway / India
Bronzite
(Mg,Fe)SiO3 (Fs12-30)
Mohs 5.5 | SG 3.35
Olive-brown body + warm golden-copper sheen
Austria / USA / South Africa
Pure Enstatite
MgSiO3 (>88% Mg)
Mohs 5.5 | SG 3.22
Clear olive/emerald gem; no metallic plates
Sri Lanka / Tanzania
Star Enstatite
MgSiO3 + Needles
Mohs 5.5 | SG 3.35
Near-90° sharp 4-ray cross star on black cab
India / Sri Lanka
Black Star Diopside
CaMgSi2O6 + Fe3O4
Mohs 5.5-6.0 | SG 3.30
Tilted 73°/107° cross star; slightly magnetic
Tamil Nadu, India
Goldstone Glass
Melted Glass + Cu
Mohs 5.5 | SG 2.65
Uniform triangular glitter at every angle
Synthetic Venetian Glass
Frequently Asked Mineralogy Questions
Collector & Lab Answers
What causes the metallic copper or silver flash in Hypersthene and Bronzite?
Exsolved microscopic thin plates of Ilmenite and Hematite aligned strictly along the (100) plane inside Orthopyroxene reflect incoming light coherently, creating a silky liquid-metal schiller flash.
What is the difference between Bronzite and Hypersthene?
Both sit in the Orthopyroxene Enstatite–Ferrosilite series: Bronzite has moderate Iron (roughly 12–30% Fe) giving warmer olive-bronze flash, while Hypersthene carries higher Iron (30–50% Fe), darker black body contrast, and brighter silver-copper sheen.
Is Hypersthene the same thing as Black Star Diopside?
No—Hypersthene/Enstatite are orthorhombic Orthopyroxenes with ~88° cleavage and near-90° star crosses, whereas Star Diopside is a monoclinic Clinopyroxene whose 4-ray star arms intersect at an oblique ~73°/107° X.
How do I tell real Bronzite from brown Goldstone glass?
Brown Goldstone is man-made glass packed with shiny triangular copper crystals that glitter evenly from every direction (SG 2.65). Natural Bronzite/Hypersthene weighs noticeably more (SG 3.35–3.55) and flashes directional silky chatoyancy along one plane.
Are Enstatite and Hypersthene found in meteorites?
Yes! Magnesium-rich Enstatite and Bronzite form major minerals in Enstatite Chondrites and HED Diogenite meteorites blasted from Asteroid 4 Vesta.