သလင်းကျောက်သည် ကမ္ဘာပေါ်တွင် ပေါများစွာ တွေ့ရသော တွင်းထွက် သတ္တုတစ်မျိုး ဖြစ်ပြီး မာခြင်းအဆင့် (၇) ရှိကာ သိပ်သည်းဆအနေဖြင့် (၂.၆၅) g/cm³ ရှိသည်။
သလင်းကျောက်
All data from the card 27
- ကဏ္ဍ
- silicate mineral
- ဖော်မျူလာ(repeating unit)
- SiO2
- Strunz classification
- 4.DA.05 (oxides)
- Dana classification
- 75.01.03.01 (tectosilicates)
- ပုံဆောင်ခဲ စနစ်
- α-quartz: trigonal β-quartz: hexagonal
- Crystal class
- α-quartz: trapezohedral (class 3 2); β-quartz: trapezohedral (class 6 2 2)
- Space group
- α-quartz: P3221 (no. 154)β-quartz: P6222 (no. 180) or P6422 (no. 181)
- Unit cell
- a = 4.9133 Å, c = 5.4053 Å; Z=3
- ဖော်မျူလာ ဒြပ်ထု
- ၆၀.၀၈ g·mol−1
- အရောင်
- Colorless through various colors to black
- Crystal habit
- 6-sided prism ending in 6-sided pyramid (typical), drusy, fine-grained to microcrystalline, massive
- Twinning
- Common Dauphine law, Brazil law and Japan law
- Cleavage
- {0110} Indistinct
- Fracture
- Conchoidal
- Tenacity
- Brittle
- Mohs scale hardness
- 7 – lower in impure varieties (defining mineral)
- Luster
- Vitreous – waxy to dull when massive
- Streak
- White
- Diaphaneity
- Transparent to nearly opaque
- Specific gravity
- 2.65; variable 2.59–2.63 in impure varieties
- Optical properties
- Uniaxial (+)
- Refractive index
- nω = 1.543–1.545 nε = 1.552–1.554
- Birefringence
- +0.009 (B-G interval)
- Pleochroism
- None
- အရည်ပျော်မှတ်
- 1670 °C (β tridymite) 1713 °C (β cristobalite)
- ပျော်ဝင်သတ္တိ
- Insoluble at STP; 1 ppmmass at 400 °C and 500 lb/in2 to 2600 ppmmass at 500 °C and 1500 lb/in2
- အခြားဂုဏ်သတ္တိများ
- lattice: hexagonal, Piezoelectric, may be triboluminescent, chiral (hence optically active if not racemic)
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