Mention 'Poudrette Quarry, Mont Saint-Hilaire' to any museum curator and one glowing image instantly pops up: bold blocky salmon-pink-orange blades of Serandite bursting effortlessly across snowy crystal spheres of Analcime! Chemically the pure Manganese twin of white Pectolite (famous Larimar's mineral!), Serandite builds razor-crisp triclinic rectangular prisms right inside Quebec's alkaline magma cavities. Tune Mn2+ saturation, pair classic companion crystals, and bust dyed pink feldspar traps.
Mont Saint-Hilaire Salmon-Orange Serandite • #1 Canadian Collector Gem
Formula: Na(Mn2+,Ca)2Si3O8(OH)
Mechanism: Mn2+ In 3-Unit Silicate Chain Paints Deep Peach-Salmon
Quebec Serandite (SG 3.32): Crisp blocky beveled triclinic columns blazing warm peach-salmon alongside snowy Analcime and dark Aegirine!
Wait — Did You Know?First found as tiny dull specks in Guinea (named after collector J.M. Sérand), Serandite only exploded into 15-cm museum statues inside Quebec's Mont Saint-Hilaire alkaline syenite pegmatite cavities—selling for $50,000+ when perched on clean Analcime!
Select Specimen or Control Sample (8 Profiles)
Click any Mont Saint-Hilaire or pyroxenoid-series crystal to compare Mn2+/Ca2+ chemistry, symmetry, and matrix icons:
Hardness / Specific GravityRI 1.66-1.69 | Biaxial (+)
Paragenesis & Optical ClueWhite Powder Streak! (Even When Red)
Shocking Pleochroism: Rotate transparent Serandite facets—peach-rose shifts cleanly to pale amber-white across axes!
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. Alkaline Nepheline-Syenite Magma Traps Volatiles
124 million years ago, a 1-km Monteregian alkaline intrusion baked Quebec shale—forming hyper-alkaline pegmatite pockets stuffed with Na, Mn, Zr, and F.
2. Manganese Invades Dreierkette Pectolite Chains
Instead of pure Calcium (white Pectolite), abundant reduced Mn2+ ions built bold salmon-orange triclinic Serandite pillars across open cavities.
3. Late Zeolites Cushion Matrix With Snowy Contrast
Final hydrothermal cooling coated cavity walls in crisp white 24-faced Analcime spheres and golden Catapleiite rosettes right around Serandite bases.
Chapter 2 of 3 • Microscopic Atomic Lattice Zoom
Inside The Lattice: Mont Saint-Hilaire Salmon-Orange Serandite
Intermediate Schizolite (50% Mn)SG 3.10 | Pale Apricot-Blush
Pure White Pectolite (0% Mn)SG 2.86 | Mohs 4.5-5.0 | Snow Fibrous
White Analcime MatrixSG 2.27 | Mohs 5.0-5.5 | 24-Faced Balls
Quick Field Myth vs. Fact Check
Common Collector Misconceptions
❌ MYTH: Serandite and Pectolite are totally unrelated minerals because one is white fibers and the other is orange blocks.
✅ FACT: They form a continuous triclinic solid-solution series! Pectolite is NaCa2Si3O8(OH) and Serandite is NaMn2Si3O8(OH)—swap Ca for Mn and white turns orange!
❌ MYTH: Mont Saint-Hilaire mines only produce pink Serandite.
✅ FACT: Poudrette Quarry holds over 430 verified mineral species—more than virtually any single square kilometer on Earth, including endemic Carletonite!
❌ MYTH: Bright orange Serandite leaves an orange streak like Crocoite or Realgar.
✅ FACT: Despite glowing electric salmon-peach in blocky prisms, grinding Serandite on porcelain leaves a plain pure white powder streak!
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
Look for the iconic Mont Saint-Hilaire companion ensemble: crisp beveled salmon-orange rectangular pillars perched on sugar-white 24-sided Analcime balls with slender black Aegirine needles.
Check directional cleavage & striations cleanly: authentic Serandite displays two strong lengthwise cleavages forming boxy beveled terminations rather than flat barite wafers.
Run a non-destructive 365 nm UV sweep over the matrix rock—not on Serandite itself (non-fluorescent!), but watching associated Leucophanite, Catapleiite, or Polylithionite flakes pop pink/yellow proves natural Saint-Hilaire paragenesis!
Never clean Serandite specimens inside acids or ultrasonics—HCl attacks co-occurring Analcime, Carletonite, and Micro-carbonates instantly.
Collector Caution & Fake Alert: CARE & VALUE WARNING: True Mont Saint-Hilaire Serandite possesses two perfect cleavage directions along its rectangular blade length AND brittle edges at Mohs 5.0–5.5! Never clean snowy Analcime/Serandite matrix in acid or ultrasonics (Zeolites/Aegirine crumble!). Also note small crystal clusters sit tightly on snowy pegmatite cavities—never force-lever crystals off matrix.
Collector Field Guide & Mineralogy Deep Dive
Locality, Chemistry & Optical Notes
🇨🇦 Poudrette Quarry: Earth's 430-Mineral Mecca
Just 40 km east of Montreal, Mont Saint-Hilaire's nepheline syenite quarry earned rockhound immortality in the 1960s–90s when blasts cracked giant hydrothermal pegmatite cavities bursting with knee-high salmon Serandite and 430+ rare species (60+ discovered there first!).
🧬 How Mn2+ Paints Pectolite Chains Orange
Manganese (Mn2+) sitting inside asymmetric 6-coordinated octahedra shifts crystal absorption away from green into clean orange-peach—producing intense pleochroism where transparent crystals flash rosy-red one way and pale straw-white 90° turned!
💎 Ultra-Rare Faceted Serandite Gems
Because Serandite packs two perfect Mohs 5.0 cleavages, almost zero facetable translucent gems exist—clean cut 1-to-4 carat Quebec Serandites sit in museum vaults alongside Painite and Taaffeite!
🤝 Aesthetic Matrix Companionship
A bare single broken orange crystal brings modest interest, while a sculpted salmon Serandite perched atop crisp white Analcime spheres framed by glossy black Aegirine swords turns into natural fine sculpture.
Diagnostic Specimen Comparison Matrix
Quick Laboratory & Collector Reference
Mineral / Control
Formula & System
Key Physical Metric
Diagnostic Tell
Classic Locality
Quebec Serandite
Na(Mn,Ca)2Si3O8(OH)
Mohs 5.0-5.5 | SG 3.32
Blocky salmon-orange pillars on Analcime
Mont Saint-Hilaire, QC
White Pectolite
NaCa2Si3O8(OH)
Mohs 4.5-5.0 | SG 2.86
White radiating fibers; zero Mn tint
New Jersey / Quebec
White Analcime
NaAlSi2O6·H2O | Cubic
Mohs 5.0-5.5 | SG 2.27
Snowy 24-faced trapezohedron spheres
MSH Matrix Host
Blue Carletonite
KNa4Ca4Si8O18(CO3)4(F,OH)·H2O
Mohs 4.0-4.5 | SG 2.45
Royal blue layered hornfels crystal (MSH only)
Mont Saint-Hilaire, QC
Gem Rhodonite
(Mn,Ca)SiO3 | Triclinic
Mohs 6.0 | SG 3.65
Blood-cherry rose; much denser SG 3.65
Brazil / Australia
Pink Barite Imposter
BaSO4 | Orthorhombic
Mohs 3.0 | SG 4.50
Brick-heavy thin rose blades; no Analcime
Peru / Morocco
Frequently Asked Mineralogy Questions
Collector & Lab Answers
Where do the best Serandite crystal specimens come from?
The Poudrette Quarry at Mont Saint-Hilaire, Quebec, Canada produced the world's finest large salmon-orange Serandite crystals—frequently associated with snow-white Analcime and jet-black Aegirine.
Are Serandite and Pectolite (Larimar) related minerals?
Yes! They share the exact same triclinic crystal structure and form a solid-solution series: Pectolite is the white Calcium end-member, while Serandite swaps Calcium for Manganese (Mn2+) to create vibrant peach-salmon.
What does Serandite's streak look like?
Even on deep reddish-orange Quebec crystals, Serandite leaves a completely white streak on unglazed porcelain.
Why is Mont Saint-Hilaire famous among mineralogists?
Over 430 distinct IMA-approved mineral species have been identified in that single alkaline syenite quarry—including more than 60 minerals discovered there for the very first time anywhere on Earth.
Can Mont Saint-Hilaire Serandite specimens be cleaned with acid?
Never! Hydrochloric or oxalic acids immediately dissolve or gel co-existing white Analcime zeolites, Carletonite carbonates, and fragile micro-minerals on the matrix.