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 Firing Gemstones and Natural Stones in Art Clay® 

Provided by Art Clay® World

This chart provides information on the gemstones and natural stones that can be safely fired with Art Clay and which stones should be avoided. Use the following key to determine what stones are safe to use with the Art Clay products available:

** - can be safely fired in place with Art Clay Silver Standard and Slow Dry Formula, in addition to all 650 Series.
(650) - can only be fired with Art Clay Silver 650 Low Fire Series.

Elected Gemstone Characteristics
Stone
Hardness (Mohs)
Specific Gravity
Refractive Index
Dispersion
Durability
Alabaster
2-2.4
2.2-2.4
1.52
med-high
low
Alexandrite**
8
3.68-3.79
1.54-1.75
low
high
Amber
2.5
1.03-1.10
1.54
none
low
Apatite (650)
5
3.16-3.22
1.64-1.65
low
medium
Aquamarine
7.75
2.68-2.70
1.57-1.58
low
high
Azurite
3.5
3.8
1.48-1.65
none
low
Beryl (650)
7.75
2.68-2.70
1.57-1.58
low
high
Cat's Eye**
8
3.68-3.79
1.54-1.75
low
high
Chalcedony
7
2.65
1.55
low
high
Chrysoberyl**
8
3.68-3.79
1.54-1.75
low
high
Corundum**
9
3.95-4.10
1.762-1.770
low
high
Diamond
10
3.52
2.42
high
high
7.75
2.66-2.70
1.57-1.58
low
high
Epidote
6
3.25-3.49
1.73-1.76
med-high
high
Feldspar
6-6.5
2.54-2.58
1.522-1.530
low
medium
7.5
3.70-4.16
1.74-1.89
med-high
high
Gypsum
1-1.5
2.3
1.53
med-high
low
Hematite (650)
5.5-6.5
4.95-5.30
2.94-3.22
none
high
Jade / Jadeite
6.5-7
3.30-3.38
1.66-1.68
none
high
Jet
3.5
1.1-1.4
1.64-1.68
none
low
Kunzite
6.5-7
3.18
1.660-1.676
medium
low
6
2.70-2.72
1.55-1.57
medium
medium
Lapis Lazuli
5
2.76-2.94
1.5
none
medium
Malachite
3.5-4
3.25-4.10
1.655-1.909
none
low
Marble
3
2.71
1.48-1.65
none
low
Moonstone (650)
6
2.58
1.518-1.526
low
high
Nephrite
6.5
2.96
1.62
none
high
Obsidian (650)
6
2.33-2.60
1.48-1.51
high
medium
Olivine
6.5-7
3.3-3.5
1.654-1.690
medium
high
Opal
6
1.97-2.20
1.45
none
low
6.5-7
3.3-3.5
1.654-1.690
low
medium
7
2.65
1.55
low
high
Rhodonite
5
3.53
1.73-1.74
none
medium
9
3.95-4.10
1.762-1.770
low
high
9
3.95-4.10
1.762-1.770
low
high
Serpentine
3.5
2.5-2.7
1.57
low
low
Sodalite
5
2.13-2.29
1.483
low
medium
Spectrolite (650)
6
2.70-2.72
1.55-1.57
low
medium
Sphene
5-5.5
3.52
1.95-2.05
high
medium
Spinel**
8
3.6
1.72
low
high
Spodumene
6.5-7
3.18
1.660-1.676
low
low
Steatite (soapstone)
1-1.5
2.7-2.8
1.540-1.590
none
low
8
3.54
1.63
low
medium
Tourmaline
7
3.06
1.63
low
high
Turquoise
5
2.6-2.8
1.61-1.65
none
medium
Zircon
7
4.02
1.81
high
high
Warning: Do not subject stones with fractures or heavy inclusions to direct heat (such as a torch or kiln). This could cause the stone to explode. Fire Mountain Gems cannot be responsible for stone breakage or accidents resulting from firing gemstones.


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Products sold by Fire Mountain Gems and Beads® are intended for experienced jewelry-makers and designer-artists;
children 14 years of age or younger should use these products with adult direction.

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