Ghost Crystal
A variety of Quartz
What is Ghost Crystal?
Ghost Crystal is an umbrella term for transparent crystals of various minerals such as quartz, calcite, fluorite, tourmaline, and others with similar properties. Specimens of these stones that can be called "ghost Crystals" are the ones that show unusual, ghost-like crystallizations or blemishes inside its more transparent mass.
Optical Properties
- Refractive Index
- 1.544-1.553
- Birefringence
- 0.009
- Pleochroism
- Weakly dichroic
- Optical Character
- Biaxial positive
- Dispersion
- 0.013
Discover Values
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Ghost Crystal before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Where to Find Ghost Crystal
Ghost Crystal is a variety of Quartz. RockHoundR, the free-to-download rockhounding map from the Ruby Glint team, shows where collectors find quartz in the US, with land-access notes for BLM land and national forests. Collecting is banned in national parks.
See where to find quartzAlways check the local rules and get the landowner's permission before you collect.
Health & Safety Information
- ⚠️Ghost Crystal in powdered form can be toxic due to its Crystalline Silica content.
- ⚠️Quartz, silica, crystalline silica and flint are non-toxic materials, but very fine dust containing quartz, known as respirable crystalline silicon (RCS), can cause serious and fatal lung disease. Lapidaries should exercise caution when cutting silica.
- ⚠️Ghost Crystal is typically non-toxic unless it's in powder form. Long-term exposure to finely ground powder may lead to silicosis. Therefore, when cutting or polishing ghost Crystal, be sure to wear a dust mask to avoid inhaling its dust.
Quick Facts
Physical Properties
- Color
- Green, colorless, white, brown, red, gray, purple, etc.
- Hardness (Mohs)
- 7
- Rock tumbling
- Tumbles well
- Density
- 2.64 - 2.69 g/cm³
- Streak
- White, colorless
- Luster
- Vitreous
- Crystal System
- Trigonal
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- O, Si
Also Known As
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Ghost Crystal FAQs
How do I identify Ghost Crystal?
Ghost Crystal can be identified by its hardness of 7 on the Mohs scale, Green color, Vitreous luster, Trigonal crystal system. Look for these key characteristics when examining specimens.
What color is Ghost Crystal?
Ghost Crystal typically appears in Green, colorless, white, brown, red, gray, purple, etc.. Color can vary depending on impurities and formation conditions.
How hard is Ghost Crystal?
Ghost Crystal has a hardness of 7 on the Mohs scale. This makes it a relatively hard mineral suitable for jewelry.
