Ako identifikovať Jade

Na správnu identifikáciu Jade (Jade (Nephrite or Jadeite)) skontrolujte každý z týchto znakov postupne. Mnohé kamene a minerály vyzerajú podobne, preto pred rozhodnutím porovnajte viacero vlastností.

Identifikácia krok za krokom

1. 1

   Farba

   Celková farba a prípadná zonálnosť alebo pásikovanie

   Nephrite: Typically shades of green (from pale to dark forest green), white, cream, grey, black, brown, or yellow. Often mottled or banded. Jadeite: Wider range of colors including emerald green (imperial jade), lavender, white, black, yellow, orange, and brown. Colors are often more vibrant and uniform than nephrite.

2. 2

   Lesk

   Ako povrch odráža svetlo: kovový, sklený, matný

   Greasy to vitreous (waxy to glassy) on polished surfaces. Nephrite tends to be more waxy/greasy, while jadeite can be more vitreous.

3. 3

   Textúra

   Veľkosť zŕn a povrch na dotyk: hrubozrnný, jemnozrnný, sklovitý

   Nephrite: Fine-grained, felted, interlocking fibrous texture, giving it exceptional toughness. Jadeite: Fine-grained, granular, interlocking texture, also contributing to its toughness.

4. 4

   Tvar kryštálov

   Tvar viditeľných kryštálov alebo kryštálových plôch

   Both nephrite and jadeite typically occur as massive, compact aggregates. Individual crystals are microscopic and not visible to the naked eye. Nephrite forms as cryptocrystalline aggregates of amphibole fibers. Jadeite forms as cryptocrystalline aggregates of pyroxene grains.

5. 5

   Štiepateľnosť

   Ako sa láme: rovné plochy štiepateľnosti vs nepravidelný lom

   Nephrite: Perfect cleavage in two directions at approximately 56° and 124° (characteristic of amphiboles), but rarely observed due to its fibrous, interlocking nature. Jadeite: Perfect cleavage in two directions at approximately 87° and 93° (characteristic of pyroxenes), also rarely observed in massive forms.

6. 6

   Geologické prostredie

   Horninová formácia a prostredie, v ktorom sa vyskytuje

   Nephrite: Found in serpentinized ultramafic rocks, often associated with contact metamorphic zones or regional metamorphic belts. Also occurs in alluvial deposits derived from these sources. Jadeite: Occurs in high-pressure, low-temperature metamorphic rocks (blueschist facies), typically within serpentinite bodies in subduction zone environments. Also found in alluvial deposits.

Kľúčové fakty

Tvrdosť

Nephrite: 6-6.5 (Mohs scale) / Jadeite: 6.5-7 (Mohs scale)

Hustota

Nephrite: 2.90-3.03 g/cm³ / Jadeite: 3.30-3.38 g/cm³

Kryštálová sústava

Nephrite: Monoclinic / Jadeite: Monoclinic

Farba

Wide range, most commonly green, white, lavender, black, yellow, orange, brown.

Lesk

Greasy to vitreous (waxy to glassy)

Priehľadnosť

Opaque to translucent, rarely semi-transparent.

Lom

Splintery to granular (Nephrite) / Uneven to splintery (Jadeite)

Štiepateľnosť

Nephrite: Perfect in two directions at 56° and 124° (rarely observed) / Jadeite: Perfect in two directions at 87° and 93° (rarely observed)

Zloženie

Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2 (calcium-magnesium-iron silicate) / Jadeite: NaAlSi2O6 (sodium-aluminum silicate)

Fyzikálne charakteristiky

• Habitus kryštálov: Massive, compact, cryptocrystalline aggregates. Nephrite forms felted, interlocking fibrous masses. Jadeite forms granular, interlocking masses.
• Typ štiepateľnosti: Nephrite: Perfect {110} at 56° and 124° / Jadeite: Perfect {110} at 87° and 93°. Both are rarely observed due to the massive, interlocking nature.
• Typ lomu: Nephrite: Splintery to granular / Jadeite: Uneven to splintery.
• Húževnatosť: Extremely tough (due to interlocking microcrystalline structure), making it highly resistant to breaking and chipping.
• Typ lesku: Greasy to vitreous (waxy to glassy)

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