Day 31: Dresden Green Diamond
• Category: Type lla
• Formula: C
• Crystal System: Type lla(?)
• Mohs Scale: 10
Happy Halloween 🎃
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#gemtober2024
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Day 30: Pink Halite
• Category: Pink Salt (?)
• Formula: NaCl
• Crystal System: Isometric (?)
• Mohs Scale: 2.5
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Day 29: Jeremejivite
• Category: Borate Mineral
• Formula: Al 6B 5O 15(F,OH) 3
• Crystal System: Hexagonal
• Mohs Scale: 6.5-7.5
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Day 28: Bicolor Tanzanite
• Category: Epidote(?)
• Formula: Ca2Al3(SiO4)(Si2O7)O(OH)
• Crystal System: Orthorhombic
• Mohs Scale: 6-7
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Day 27: Rutilated Quartz
• Category: Quartz
• Formula: SiO2 with TiO2
• Crystal System: Hexagonal
• Mohs Scale: 6-7.5
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Day 26: Blue Celestite on Calcite
• Category:
• Celestine (Stronium Sulfate) and Calcite (Carbonate
• Formula: SrSO4 and CaCO3
• Crystal System: Orthorhombic and Trigonal
• Mohs Scale: 3-3.5
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Day 25: Durangite
• Category: Tiasite
• Formula:NaAl(AsO4)F
• Crystal System: Monoclinic
• Mohs Scale: 5.5
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Day 24: Chlorastrolite
• Category: Pumpellyite
• Formula: Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2·H2O
• Crystal System: Monoclinic Prismatic
• Mohs Scale: 5.0-6.5
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Day 23: Iris Agate
• Category: Quartz(?)
• Formula: SiO2
• Crystal System: Trigonal
• Mohs Scale: 6.5-7
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Day 22: Titanite
• Category: Nesosclicate
• Formula: CaTiSiO5
• Crystal System: Monoclinic
• Mohs Scale: 5.5
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Day 21: Calcite Rose
• Category: Carbonate mineral
• Formula: CaCO3
• Crystal System: Trigonal
• Mohs Scale: 3
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Day 20: Cuprite on Malachite
• Category: Copper Ore(?)
• Formula: Cu2CO3(OH)2
• Crystal System: Isometric System Hexoctahedral Class
• Mohs Scale: 3.5-4
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Day 19: Orca Agate
• Category: Chalcedony
• Formula: SiO2
• Crystal System: Trigonal or Monoclinic
• Mohs Scale: 6.5-7
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Day 18: Ajoite
• Category: Silicate Mineral
• Formula: (Na,K)Cu7AlSi9O24(OH)6·3H2O
• Crystal System: Pinacoidal
• Mohs Scale: 3.5
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Day 17: Cornflower Blue Opal
• Category: Mineraloid
• Formula: SiO2.nH2O
• Crystal System: (?)
• Mohs Scale:
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Day 16: Lemon Quartz
• Category: Quartz
• Formula: (SiO2)
• Crystal System: Trigonal
• Mohs Scale: 7
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Day 15: Taenite
• Category: Metallic and Intermetallic Alloys
• Formula: (Fe,Ni) or (Ni,Fe)
• Crystal System: Isometric
• Mohs Scale: 5-5.5
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Day 13: Quenselite
• Category: Hydroxide minerals
• Formula: PbMn3+O2(OH)
• Crystal System: Monoclinic
• Mohs Scale: 2.5
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Day 12: Painite
• Category: Borate Minerals
• Formula: CaZrAl9O15(BO3)
• Crystal System: Hexagonal
• Mohs Scale: 7.5-8
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Day 11: Langite
• Category: Copper Minerals
• Formula: Cu4(SO4)(OH)6·2H2O
• Crystal System: Monoclinic
• Mohs Scale: 2.5-3
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Day 10: Pallasite
• Category: Stony-iron meteorites
• Formula: (Mg²⁺, Fe²⁺)₂SiO₄
• Crystal System: Isometric and Hexoctahedral
• Mohs Scale: 4-5(?)
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Day 9: Purple Vesuvianite
• Category: Sorosilicate
• Formula: Ca10(Mg, Fe)2Al4(SiO4)5(Si2O7)2(OH,F)4
• Crystal System: Tetragonal
• Mohs Scale: 6-7
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