-
Gemstones ABC
-
A
- Strawberry Quartz B
- Actinolite quartz
- Aegirine
- Agate Group
- Ajoite (in Quartz)
- Alexandrite
- Amazonite
- Amber
- Amethyst
- Ametrine
- Ammolite
- Andalusite
- Andean Opal
- Angelite
- Anyolite
- Apache Tear
- Apatite
- Apophylite
- Aquamarine
- Aragonite
- Astrophylite
- Atlantisite
- Auralite 23
- Aventurine
- Aventurine-Feldspar
- Azurite
- Azurmalachite
- B
-
C
- D - F
- G-H-I
- H - I
- J - K
- L
- M
- N - O
-
P - Q
- Purple Fluorite
- Pearl & Mother of Pearl
- Peridot
- Peach Moonstone
- Petalite
- Pietersite
- Praseolite
- Prehnite
- Pyrite
- Pyroop
- Pyroxene Group
- Quantum Quattro
- Rainbow Fluorite
- Rainbow Moonstone
- Rainbow Obsidian
- Rhodochrosite
- Rhodonite
- Rhyolite
- Ruby
- Ruby in Zoisite
- Red Agate
- Red Garnet
- Red Jasper
- Smoky Quartz
- Rose Quartz
- Rubellite
- Rutilated Quartz
- R
-
S
- Sapphire
- Schörl
- Foam Coral
- Selenite
- Septarian
- Seraphinite
- Serpentine (New Jade)
- Shungite
- Sphalerite
- Emerald
- Smithsonite
- Snow quartz
- Snowflake Obsidian
- Sodalite
- Spectrolite
- Spinel
- Spodumene
- Spodumene, White
- Stibnite
- Stichtite
- Staurolite Fairy Cross
- Star Rose Quartz
- Strawberry Quartz
- Stromatolite
- Sugilite
- Super 7
- Shell
- T - U
-
V - Z
- Hawk's eye
- Vanadinite
- Variscite
- Feldspar Group
- Verdelite, green Tourmaline
- Petrified Wood
- Petrified Coral (Petoskey Stone)
- Vesuvianite
- Fire Opal
- Watermelon Tourmaline
- Wavellite
- White Quartz
- White Selenite
- White spodumene
- Desert Rose
- Starfish
- Zincite
- Zircon
- Zoisite Group
- Aventurine-Feldspar
- Black tourmaline
- Sulphur
- Other Gemstones
-
A
- Gem Colors
-
Jewelry
- GemJudith Jewelry
- Bracelets
- Pendants
- Necklaces
- Earrings
-
Rings
-
Ringsizes
- 3.5 / G
- 4 / H
- 4.5 / J
- 5 / J 1/2
- 5.5 / L
- 5 ¾ / L ½
- 6 / M
- 6.5 / N
- 7 / O
- 7.5 / O ½
- 7.5 / P
- 8 / Q
- 8.5 / Q-Q1/2
- 9 / R 1/2 - S 1/2
- 9 ¼ / S ½
- 9.5 / S 1/2 - T
- 10 / T½
- 10-10.5 / T 1/2 - V
- 10.5 / V
- 11 / V 1/2 - W
- 11 / W
- 12
- 12 / Y
- 12.5 - 13 / Y 1/2 - Z+1
- 13.5 / Z+1 - Z+2
- 13 3/4 - 14 / Z+21/2 - Z+3
- one size fits all
- Gemstone Rings
- Precious Stones in Brass Rings
- Gemstone Silver Rings
-
Ringsizes
- Silver
- Jewelery Design
- Clearance Jewelry
- Jewelry on Color
- Unique Carvings
Gypsum
Gypsum
The first known mention is about 300-325 BC by Theophrastus. From the Greek γυψοζ (plaster), which means Gypsum.
Data:
| Formula: | CaSO4 · 2H2O |
| Color: | Colorless to white (often tinted by impurities), colorless in transmitted light |
| Gloss: | Glassy, sub-glassy, silky, pearly white, dull |
| Hardness: | 2 |
| Specific weight: | 2.312 - 2.322 |
| Crystal System: | Monoclinic |
| Transparency: | Translucent to Opaque |
| Location: | Brazil, Morocco, the Netherlands etc, |
Gypsum has an Isostructure with: Ardealite, Brushite, Pharmacolite
Gypsum is the most common sulfate mineral. Can be found as solid material, including the alabaster variety; and clear crystals, the selenite variety and parallel fibrous, the satin tree variety. Typically colorless to white, transparent crystals, thick tabular to lenticular, sometimes prismatic.
The Gypsum Group consists of, among others: Anhydrite, Selenite, Desert Rose
Alabaster - A fine-grained massive form of Gypsum.
Satin Spar - A fibrous variety of Gypsum.
Selenite - Transparent-translucent colorless variety of Gypsum.
If in stock you will find below my collection of Raw Gemstones.
Are you looking for cut Edelsten from the Gips Groep, then look at GYPSUM GROUP
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