[DOC] [TLE] J! Archive - Show #313, aired 1985-11-20 [PAR] Of historic value, recreational value, or natural features, reason most nat'l ... 
When chemically pure, without metallic oxides, most gems lack this characteristic
... [DOC] [TLE] Metals, Nonmetals and Metalloids - MikeBlaber.org [PAR] Characteristic properties of metallic and non-metallic elements: ... and typically 
lose electrons (i.e. are oxidized) when they undergo chemical reactions ... Most 
metal oxides are basic oxides; those that dissolve in water react to form metal ... 
but is not malleable or ductile (it is brittle - a characteristic of some nonmetals). [DOC] [TLE] The Chemistry of Carbon [PAR] The Oxides of Carbon, CO2 In the Atmosphere, The Chemistry of ... For more 
than 200 years, chemists have divided compounds into two ... The characteristic 
properties of graphite and diamond might lead you to ... Although gem-quality 
diamonds can be synthesized, the costs involved are ... they lack a regular 
structure. [DOC] [TLE] Mineral - Wikipedia [PAR] A mineral is a naturally occurring chemical compound, usually of crystalline form 
and abiogenic ... Minerals are distinguished by various chemical and physical 
properties. .... Although biominerals and liquid mineral crystals, are not the most 
common .... In nature, minerals are not pure substances, and are contaminated 
by... [DOC] [TLE] Beryllium - Wikipedia [PAR] Beryllium is a chemical element with symbol Be and atomic number 4. It is a 
relatively rare ... Beryllium does not form oxides until it reaches very high 
temperatures. ... which make beryllium the metal with the best heat dissipation 
characteristics per .... It is more chemically similar to aluminium than its close 
neighbors in the... [DOC] [TLE] Carbon - Wikipedia [PAR] Carbon (from Latin: carbo "coal") is a chemical element with symbol C and atomic 
number 6. ... The physical properties of carbon vary widely with the allotropic form
. ... Carbon forms a vast number of compounds, more than any other element, 
with ... oxides, and will rob oxygen from metal oxides to leave the elemental metal
. [DOC] [TLE] TRANSITION METALS chemical reactions physical properties uses ... [PAR] The Physical and Chemical Properties of the Transition Metal Elements Series ... 
(f) More on uses of Transition Metals/compounds/alloys ..... formation, is another 
characteristic (but not unique) feature of transition metal chemistry. .... However 
pure copper, gold, iron (three transition metals) and aluminium (non-transition... [DOC] [TLE] Physical Properties of Gems - Gemology Course [PAR] Properties of Gemstones: There are two sets of characteristics possessed by 
every ... Crystalline gems have a specific chemical formula, and a well defined, 
highly ..... Oxides: This group will have one or more oxygen atoms (not grouped 
with ... Since cleavage, or lack of it, is a species trait, it also serves as a good gem
... [DOC] [TLE] Chemistry - Ray Sahelian, M.D. [PAR] Lignite soft coal wood with characteristics between coal and peat ... Copper 
element is Cu, It was the first nonprecious metal man made into tools & 
decorative .... Noble gases make a group of chemical elements with similar 
properties: under .... GEMS - When chemically pure, without metallic oxides, most 
gems lack color. [DOC] [TLE] Minerals facts, information, pictures | Encyclopedia.com articles ... [PAR] Minerals are not to be confused with rocks, which are typically aggregates of 
minerals. ... In this sense, the definition of a mineral is even more restricted than 
that of an ... PHYSICAL AND CHEMICAL PROPERTIES OF MINERALS. ..... other 
things) metallic elements that appear in pure form somewhere on Earth: 
aluminum,... [DOC] [TLE] Chapter 63 - Metal: Chemical Properties and Toxicity [PAR] Aluminium is the most abundant metal in the earth's crust, where it is found in ..... 
The signs and symptoms of poisoning are those characteristic of an acute ..... 
Chromium oxide is also used for the production of pure chromium metal that ...... 
not been possible owing to a lack of serious cases of industrial exposures to 
indium. [DOC] [TLE] The Quartz Page: Quartz as a Rock-Forming Mineral [PAR] Oct 3,

Question: When chemically pure, without metallic oxides, most gems lack this characteristic property
Answer: color