Collection

Primary collection focus is on circulation coins from Lithuania, Baltic region. Starts from USSR and Lithuania in interwar period. Extends up to current Euro for all EU. Other coins collected through all the world as oddities.

Metal composition

Various bits of information about alloys used in coins.

* First Lithuanian republic
1925 - 1,5,10,20,50 cents - 90% Cu, 10% Al
1925 - 1,2,5 litas - Silver, 50% Ag, 50% Cu
1936 - 1,2,5 cents - Bronze, 95% Cu, 4% Sn, 1% Zn
1936 - 5,10 litas - Silver, 75% Ag, 25% Cu
1938 - 10 litas - Silver, 75% Ag, 25% Cu

2012 - 50 litas - Bronze replica 

* Second Lithuanian republic
1991 - 1,2,5 cents - Aluminium
1991 - 10,20,50 cents - Bronze
1991 - 1,2,5 litas - Copper-Nickel
1997-2014 - 10,20,50 cents - Nickel Brass
1998-2014 - 1 litas - Copper-Nickel
1998-2014 - 2 litas - Bi-Metallic: Copper-Nickel center, Brass ring
1998-2014 - 5 litas - Bi-Metallic: Brass center, Copper-Nickel ring

Commemorative coins
1 litas - Copper-Nickel
2 litas - Bi-Metallic: Copper-Nickel center, Nickel-Brass ring

Collector coins in silver (0.925) or gold (0.999). Some are in nordic gold or 
Copper-Nickel.

* RSFSR
1921-1923 - 10,15,20 kopeks - Silver, 50% Ag
1921-1922 - 50 kopeks, 1 ruble - Silver, 90% Ag
1923 - 1 chervonets - Gold, 90% Au

* USSR
1925-1928 - ½ kopek - Copper
1924-1925 - 1,2,3,5 kopeks - Copper
1924-1931 - 10,15,20 kopeks - Silver, 50% Ag
1924-1927 - 1 poltinik - Silver, 90% Ag
1924 - 1 ruble - Silver, 90% Ag
1926-1958 - 1,2,3,5 kopeks - Aluminium-Bronze
1931-1958 - 10,15,20 kopeks - Copper-Nickel
1961-1991 - 1,2,3,5 kopeks - Brass
1961-1991 - 10,15,20,50 kopeks - Copper-Zinc-Nickel
1991 - 10 kopeks - Copper plated Steel
1991 - 50 kopeks, 1,5 ruble - Copper-Nickel
1991-1992 - 10 rubles - Bi-Metallic: Aluminium-Bronze center, Copper-Nickel ring
1991 - 5 rubles (commemorative) - Bi-Metallic: Brass center, Copper-Nickel ring

Commemorative coins in Copper-Zinc-Nickel or Nickel Silver
Collector coins in silver, gold, platinium or palladium.

* Euro
1999+ - 1,2,5 cents - Copper plated Steel
1999+ - 10,20,50 cents - Nordic gold (Cu Zn Al Sn)
1999+ - 1 euro - Bi-Metallic: Copper-Nickel plated Nickel center, Nickel-Brass ring
1999+ - 2 euro - Bi-Metallic: Nickel-Brass plated Nickel center, Copper-Nickel ring


Alloys
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Bronze - Bronze is an alloy consisting primarily of copper, commonly with about 
  12–12.5% tin and often with the addition of other metals (such as aluminium, 
  manganese, nickel or zinc) and sometimes non-metals or metalloids such as arsenic, 
  phosphorus or silicon.

Brass - Brass is an alloy of copper and zinc, in proportions which can be varied to 
  achieve varying mechanical and electrical properties. It is a substitutional 
  alloy: atoms of the two constituents may replace each other within the same crystal 
  structure.

  Brass is similar to bronze, another alloy containing copper, with tin included 
  instead of zinc; both bronze and brass may include small proportions of a range 
  of other elements including arsenic, lead, phosphorus, aluminum, manganese, and 
  silicon. The distinction between the two alloys is largely historical, and modern 
  practice in museums and archaeology increasingly avoids both terms for historical 
  objects in favour of the more general "copper alloy". 

Nickel Brass - 
  70-80% Copper, 20-25% Zinc, and 1-5% Nickel

Nickel Silver - Nickel silver, a range of alloys of copper, nickel, and zinc which 
  are silvery in appearance but contain no silver. Its composition varies from 7 to 
  30 percent nickel, the alloy most widely used being 18 percent nickel silver (18 
  percent nickel, 62 percent copper, 20 percent zinc).

Copper-Nickel/Cupro-nickel
  75-85% Copper and 15-25% Nickel 

Nordic gold - Nordic gold is the gold-coloured copper alloy from which many coins 
  are made. It had been in use for a number of coins in many currencies, most 
  notably in euro 50, 20, and 10 cents, in the Swedish 5 and 10 kronor coins, the 
  latter of which it was originally developed for, as well as the Polish 2 złote 
  commemorative coins. Its composition is 89% copper, 5% aluminium, 5% zinc, and 
  1% tin.

Billon
    >50% Copper, 50% Silver 

Coin-Silver
    90% Silver

Silver, Sterling
    92.5% Silver, 7.5% Copper

Acmonital - (Acciaio Monetario Italiano) Italian monetary steel.
  l'"acmonital ferromagnetico" - 82% steel, 18% chromium. AISI 430 standard
  l'"acmonital amagnetico" - 72% steel, 18% chromium, 10% nickel. AISI 304 standard

Bronzital - (Bronzo Italiano) Italian bronze. Composition is 92% copper, 6%
  aluminium, 2% nickel. (Cu92Al6Ni2)

References