Gottlobite
A variety of Minerals
What is Gottlobite?
Gottlobite, CaMg(VO4,AsO4)(OH), is a mineral found as isolated crystals or isometric grains of orange or orange-brown color. The size of the crystals are a half millimeter in diameter and are part of the orthorhombic crystal system. Gottlobite forms a solid solution with adelite, which is an end member composition of CaMg(VO4)(OH), as well as being classified in the adelite group. Gottlobite is also part of the vanadates and arsenates group. With these characteristics, it is similar to the minerals tangeite and austinite by X-ray diffraction methods.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Gottlobite 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.
Gottlobite Localities Map
See where Gottlobite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Composition of Gottlobite
Analytical methods used on gottlobite to determine its chemical composition include energy-dispersive X-ray spectrometry (EDX) and wavelength-dispersive X-ray spectrometry (WDX). EDX revealed the presence and quantities of elements present in the mineral, including Ca, V, As, O and small amounts of Sr. This was then measured in terms of oxides, where the weight percents were 24.98 for CaO, 0.92 for SrO, 17.54 for MgO, 1.50 for MnO, 1.44 for CuO, 27.47 for V2O5, 20.32 for As2O5, and 5.4 for H2O. Mg is in gottlobite's chemical formula, but was not found in the EDX testing because of very similar pattern of arsenic lines that were overlapping with magnesium. The full empirical formula of gottlobite is (Ca0.93,Sr0.03)(Mg0.91,Mn0.04,Cu0.04)(V0.63,As0.37)O4O1.08H1.26. As seen in the formula, it was also determined that the arsenic and vanadium atoms are in 4-fold (tetrahedral) coordination with oxygen, and the magnesium atoms are in six-fold (octahedral) coordination.
Quick Facts
Physical Properties
- Color
- Orange to orange-brown
- Hardness (Mohs)
- 4.5
- Density
- 3.46 g/cm³
- Streak
- brownish white
Chemical Properties
- Chemical Formula
- CaMg(VO4,AsO4)(OH)
- Elements
- Ca, H, Mg, O, V
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Gottlobite FAQs
How do I identify Gottlobite?
Gottlobite can be identified by its hardness of 4.5 on the Mohs scale, Orange to orange-brown color. Look for these key characteristics when examining specimens.
What color is Gottlobite?
Gottlobite typically appears in Orange to orange-brown. Color can vary depending on impurities and formation conditions.
How hard is Gottlobite?
Gottlobite has a hardness of 4.5 on the Mohs scale. This gives it moderate hardness.
What is the composition of gottlobite of Gottlobite?
Analytical methods used on gottlobite to determine its chemical composition include energy-dispersive X-ray spectrometry (EDX) and wavelength-dispersive X-ray spectrometry (WDX). EDX revealed the presence and quantities of elements present in the mineral, including Ca, V, As, O and small amounts of Sr. This was then measured in terms of oxides, where the weight percents were 24.98 for CaO, 0.92 for SrO, 17.54 for MgO, 1.50 for MnO, 1.44 for CuO, 27.47 for V2O5, 20.32 for As2O5, and 5.4 for H2O. Mg is in gottlobite's chemical formula, but was not found in the EDX testing because of very similar pattern of arsenic lines that were overlapping with magnesium. The full empirical formula of gottlobite is (Ca0.93,Sr0.03)(Mg0.91,Mn0.04,Cu0.04)(V0.63,As0.37)O4O1.08H1.26. As seen in the formula, it was also determined that the arsenic and vanadium atoms are in 4-fold (tetrahedral) coordination with oxygen, and the magnesium atoms are in six-fold (octahedral) coordination.
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